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- |elName=Helium '''Helium''' is a [[Chemical elements|chemical element]], typically found as a [[gas]938 bytes (135 words) - 16:58, 1 January 2021
- 12 bytes (1 word) - 16:21, 27 June 2008
- 12 bytes (1 word) - 07:32, 15 January 2008
- {{Basic elemental def|Helium}}66 bytes (7 words) - 13:55, 28 April 2010
- 3 bytes (2 words) - 23:16, 9 June 2008
- 9 bytes (1 word) - 15:19, 12 June 2008
- *[[Superfluidity]] of Helium94 bytes (11 words) - 09:53, 7 December 2022
- 82 bytes (10 words) - 15:00, 14 June 2008
- 84 bytes (10 words) - 22:13, 14 April 2011
- 29 bytes (2 words) - 15:21, 12 June 2008
- 9 bytes (2 words) - 15:15, 12 June 2008
- 984 bytes (137 words) - 06:57, 6 March 2024
- 105 bytes (12 words) - 15:29, 17 May 2010
- ...Note:Solid Helium is not possible under normal atmospheric pressure, See [[Helium/Melting point]] for details.</noinclude>174 bytes (23 words) - 06:34, 16 December 2008
- #REDIRECT [[Helium/Ground state electron configuration]]56 bytes (6 words) - 13:11, 13 June 2008
- 1 bytes (0 words) - 23:15, 9 June 2008
- 12 bytes (2 words) - 15:17, 12 June 2008
- 15 bytes (1 word) - 12:17, 27 June 2008
- Auto-populated based on [[Special:WhatLinksHere/Helium]]. Needs checking by a human.2 KB (323 words) - 12:57, 15 March 2024
- 3 bytes (1 word) - 13:50, 29 June 2008
- 6 bytes (0 words) - 15:19, 12 June 2008
- ...cienceblogs.com/startswithabang/2010/03/why_is_helium_so_scarce.php Why is Helium so Scarce?] - an introductory blog post on the limited availability of this197 bytes (29 words) - 20:30, 17 March 2010
- 2 bytes (1 word) - 18:00, 10 June 2008
- <includeonly>Noble gas</includeonly><noinclude>Helium is a [[noble gas]].</noinclude>85 bytes (11 words) - 05:50, 6 March 2024
- #REDIRECT [[Helium/Periodic table of elements]]47 bytes (6 words) - 08:22, 6 March 2024
- ...ordinary pressures, but will readily solidify by increasing the pressure. Helium-4 (<sup>4</sup>H) has a sharp transition temperature at 2.174K. Above this549 bytes (84 words) - 22:08, 14 April 2011
- 13 bytes (2 words) - 15:20, 12 June 2008
- 27 bytes (4 words) - 16:24, 22 April 2011
- 28 bytes (4 words) - 16:25, 22 April 2011
- 14 bytes (3 words) - 13:11, 13 June 2008
Page text matches
- ...Note:Solid Helium is not possible under normal atmospheric pressure, See [[Helium/Melting point]] for details.</noinclude>174 bytes (23 words) - 06:34, 16 December 2008
- #REDIRECT [[Helium]]20 bytes (2 words) - 18:42, 31 May 2008
- {{Basic elemental def|Helium}}66 bytes (7 words) - 13:55, 28 April 2010
- #REDIRECT [[Helium/Periodic table of elements]]47 bytes (6 words) - 08:22, 6 March 2024
- #REDIRECT [[Helium/Ground state electron configuration]]56 bytes (6 words) - 13:11, 13 June 2008
- |elName=Helium '''Helium''' is a [[Chemical elements|chemical element]], typically found as a [[gas]938 bytes (135 words) - 16:58, 1 January 2021
- *[[Superfluidity]] of Helium94 bytes (11 words) - 09:53, 7 December 2022
- ...bric structure, often shaped like an [[airship]] and usually filled with [[helium]] that is restrained by a cable attached to the ground or a vehicle. Moore ...shaped (i.e. blimp shaped) with fins to stabilise them, but relying upon [[helium]] alone for lift897 bytes (135 words) - 17:47, 27 January 2008
- helium nucleus; particle of charge 2''e'' and mass 4 u.91 bytes (12 words) - 05:11, 12 June 2009
- ...ordinary pressures, but will readily solidify by increasing the pressure. Helium-4 (<sup>4</sup>H) has a sharp transition temperature at 2.174K. Above this549 bytes (84 words) - 22:08, 14 April 2011
- ...cienceblogs.com/startswithabang/2010/03/why_is_helium_so_scarce.php Why is Helium so Scarce?] - an introductory blog post on the limited availability of this197 bytes (29 words) - 20:30, 17 March 2010
- A nuclear reactor using [[helium]] gas as a coolant, that might provide process heat for production of zero-196 bytes (31 words) - 02:53, 7 April 2024
- ...ted fabric structure, often shaped like an airship and usually filled with helium, that is restrained by a cable attached to the ground or a vehicle.191 bytes (29 words) - 10:21, 11 September 2009
- ...ilizes a [[nucleus]] by emitting an [[alpha particle]], the nucleus of a [[helium]] atom (He<sup>2+</sup>).174 bytes (23 words) - 09:22, 5 July 2008
- ...o being filled with a gas less dense than air or lighter than air (such as helium or hydrogen).166 bytes (28 words) - 23:45, 3 September 2009
- ...tio oxygen/helium of 32/4 = 8 leads to the prediction by Graham's law that helium will diffuse about 2.8 times (the square root of 8 is 2.83) as quickly as o1 KB (165 words) - 07:59, 29 March 2008
- a medium-sized, next-gen, uranium-fueled, graphite-moderated, helium-cooled [[nuclear reactor|reactor]] that can provide heat for industrial pro232 bytes (25 words) - 09:57, 25 January 2023
- <includeonly>Noble gas</includeonly><noinclude>Helium is a [[noble gas]].</noinclude>85 bytes (11 words) - 05:50, 6 March 2024
- ...tomic nucleus by emitting an [[alpha particle]], which is the nucleus of a helium atom. ...forms of radiation alpha particles are also one of the primary sources of helium on earth.744 bytes (120 words) - 16:27, 19 December 2007
- ...ted by a secondary cooling devise to help remove the heat generated by the helium pump. The secondary cooling devise is generally a circulating water cooler.957 bytes (151 words) - 15:21, 2 August 2008
- ...argo]] from the [[United States of America]] (which had a near monopoly on Helium supplies at the time) flammable [[Hydrogen]] was used instead.1,019 bytes (159 words) - 13:19, 2 February 2023
- '''Noble gases''' are a group of inert [[gas]] [[element]]s, including [[helium]], [[neon]], [[argon]], [[krypton]], [[xenon]], and [[radon]]. In an inert339 bytes (45 words) - 22:27, 20 May 2022
- The vast majority of blimps are filled with [[Helium]] which provides their buoyancy. Blimps that use hot air rather than Helium are called [[thermal airships]].1 KB (182 words) - 12:01, 10 March 2008
- {{r|Helium}}262 bytes (30 words) - 17:56, 22 February 2011
- {{r|Helium}}379 bytes (50 words) - 05:22, 3 September 2009
- {{r|Peak helium}}422 bytes (57 words) - 09:03, 15 April 2010
- using an unheated gas such as [[Helium]].531 bytes (85 words) - 08:15, 8 June 2009
- ...tion]] and providing a new approach to the placement of [[hydrogen]] and [[helium]].616 bytes (84 words) - 06:33, 6 March 2024
- {{r|Helium}}456 bytes (59 words) - 20:58, 11 January 2010
- {{r|Helium}}553 bytes (74 words) - 11:09, 11 January 2010
- {{r|Helium}}540 bytes (71 words) - 17:12, 11 January 2010
- {{r|Helium}}624 bytes (83 words) - 11:58, 31 December 2022
- {{r|Helium}}515 bytes (67 words) - 19:03, 11 January 2010
- ...[reactor moderator#graphite|graphite-moderated]], [[reactor coolant#helium|helium-cooled]] reactor with a once-through [[uranium]] fuel cycle. Its primary pu2 KB (319 words) - 16:20, 8 January 2023
- {{r|Helium}}576 bytes (76 words) - 17:17, 11 January 2010
- ...s where the nuclei of several [[Hydrogen]] atoms fuse to form an atom of [[Helium]]. Every star above the main sequence will be a luminous [[giant star]], n ...rugal rate at which the small, dim red dwarfs turn their [[Hydrogen]] to [[Helium]] make them long-lived, and the Universe is too young for any red dwarf to3 KB (519 words) - 12:22, 12 April 2022
- {{r|Helium}}688 bytes (92 words) - 05:21, 19 July 2010
- ...he scheme: <sup>238</sup>U---><sup>234</sup>[[Thorium|Th]] + <sup>4</sup>[[Helium|He]] where the energy released in the transformation is Q=4.25[[Electron vo2 KB (381 words) - 22:48, 15 June 2010
- ...ted by a gas contained within an envelope. The most typical gas used is [[helium]].807 bytes (132 words) - 16:55, 2 November 2021
- ...ing around it. It mainly consists of [[hydrogen]], which it converts to [[helium]] through a process of [[nuclear fusion]], providing the heat and light tha Hydrogen, about 75%; helium, about 25%; at least 70 other elements make up the remaining 1 to 2 percent3 KB (381 words) - 20:54, 21 July 2020
- ...lope and the ambient air. (This is in contrast to the more common use of [[Helium]] to provide lift.) Currently all thermal airships use hot air, as used in Thermal airships have the advantage of being less expensive than [[helium]]-based airships. They are also routinely deflated after each flight and c4 KB (586 words) - 06:17, 12 September 2013
- {{r|Helium}}1 KB (164 words) - 09:18, 6 March 2024
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- ...[elementary charge]]. An α-particle is in fact the nucleus of the [[helium]]-4 [[isotope]], consisting of two [[proton]]s and two [[neutron]]s, thus h ...ption required </ref> in which it was explained that α-particles are helium atoms that have lost their negative charge. In 1908 it was not yet known th3 KB (412 words) - 20:02, 20 September 2021
- {{r|Helium}}1 KB (194 words) - 12:49, 15 March 2024
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- {{r|Helium}}1 KB (201 words) - 12:57, 15 March 2024
- ...ic and subatomic particles, such as [[electron]]s (β-radiation) and [[helium]] nuclei (α-radiation), or of high-energy massless particles, [[photo ...e a (theoretical) [[rest mass]] of zero. The α and β particles (helium nuclei and electrons) have rest mass not equal to zero; the same is true f3 KB (523 words) - 21:16, 22 July 2010
- {{r|Helium}}2 KB (210 words) - 09:18, 6 March 2024
- {{r|Helium}}2 KB (208 words) - 12:49, 15 March 2024
- ...when the Earth first formed its atmosphere mostly contained hydrogen and [[helium]], but the gravity was not strong enough to hold onto these light gases and ...[[Jupiter]], [[Saturn]], [[Uranus]] and [[Neptune]] have more hydrogen and helium in their atmosphere. Being further out from the sun they received large amo3 KB (509 words) - 11:48, 2 February 2023
- {{r|Helium}}1 KB (209 words) - 12:57, 15 March 2024
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- A '''very high temperature reactor''' is a nuclear reactor using helium gas as a coolant, that might provide process heat for production of zero-ca1 KB (194 words) - 18:15, 4 January 2022
- {{r|Helium}}2 KB (224 words) - 12:49, 15 March 2024
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- ...normal [[boiling point]]s of the so-called permanent [[gases]] (such as [[helium]], [[hydrogen]], [[neon]], [[nitrogen]], [[oxygen]], and normal [[Earth's a ...element in cryogenics and is legally purchasable around the world. Liquid helium is also commonly used and allows for the lowest attainable temperatures to7 KB (1,043 words) - 09:37, 6 March 2024
- {{r|Helium}}2 KB (280 words) - 09:18, 6 March 2024
- ..., about 51 K (−222 °C), and for [[hydrogen]], about 202 K (-71 °C). Thus, helium and hydrogen will warm during a J-T expansion at typical room temperatures. .... For this reason, a simple Linde cycle cannot normally be used to liquefy helium, hydrogen and [[neon]].7 KB (1,081 words) - 05:42, 4 September 2013
- ..., about 51 K (−222 °C), and for [[hydrogen]], about 202 K (-71 °C). Thus, helium and hydrogen will warm during a J-T expansion at typical room temperatures. .... For this reason, a simple Linde cycle cannot normally be used to liquefy helium, hydrogen and [[neon]].7 KB (1,084 words) - 05:41, 4 September 2013
- ...aluminium, calcium magnesium, and iron). The lightest elements, hydrogen, helium and lithium, were formed during the [[Big Bang]]. Heavier elements were cre ...omposition of interstellar matter, by mass, is about 70.4% hydrogen, 28.1% helium and 1.5% heavier elements, similar to the ratios measured in the Sun, other7 KB (987 words) - 10:12, 30 May 2009
- {{r|Helium}}2 KB (289 words) - 12:57, 15 March 2024
- ...r Blimp N2A to Europe from 1972 to 1986. Includes a very complete list of helium airship (i.e. does not include hot air airships) [http://www.blimp-n2a.com/ ...u/english/products.html RosAero] — Russian airship company that makes both Helium and hot air airships12 KB (1,729 words) - 20:00, 14 February 2010
- Auto-populated based on [[Special:WhatLinksHere/Helium]]. Needs checking by a human.2 KB (323 words) - 12:57, 15 March 2024
- Red dwarfs [[Nuclear fusion|fuse]] [[hydrogen]] to [[helium]] via the [[Pp chain|proton-proton (PP) chain]]. Due to the low temperature ...]] model predicts the first generation of stars should have only hydrogen, helium and [[lithium]]. If such stars included red dwarfs, they should still be ob7 KB (1,111 words) - 11:24, 30 July 2022
- ...egularities that were observed in the spectra of atomic [[hydrogen]] and [[helium]]. Initially they thought that electrons rotate physically about an axis, h2 KB (357 words) - 10:17, 8 April 2023
- ...the next rigid airship to enter Navy service, was at first filled with the helium from the ''Shenandoah'' until more could be procured. ...men who would handle and supply the airship were added; facilities for the helium, [[gasoline]], and other supplies necessary for ''Shenandoah'' were built;10 KB (1,528 words) - 09:44, 5 August 2023
- or to a helium isotope and emit a neutron:3 KB (478 words) - 05:12, 23 October 2013
- {{r|Helium}}3 KB (457 words) - 12:49, 15 March 2024
- ...he looming war prevented German access to the required large quantities of helium, leading to the conversion of the Hindenburg to a hydrogen design. However6 KB (973 words) - 10:23, 8 April 2023
- *Monatomic elemental gases: [[helium]] (He), [[neon]] (Ne), [[argon]] (Ar), [[krypton]] (Kr) and [[xenon]] (Xe) ...ve extremely low reactivity. The six naturally occurring noble gases are [[helium]] (He), [[neon]] (Ne), [[argon]] (Ar), [[krypton]] (Kr), [[xenon]] (Xe), an8 KB (1,191 words) - 19:28, 22 January 2011
- ...4He) (24% of total mass) and trace amounts of the isotopes deuterium (2H), helium-3 (3He) and lithium (7Li). Subsequently the interstellar medium within gala8 KB (1,199 words) - 20:34, 8 June 2010
- ...crease can be obtained by cooling the electronic components to near liquid helium temperatures, which greatly decreases electronic noise.3 KB (514 words) - 08:57, 1 June 2008
- ...electrodynamics]], the physics of the superfluidity of supercooled liquid helium, and particle theory. His work on quantum electrodynamics made him a joint3 KB (482 words) - 12:53, 25 June 2013
- .... Pierce]] in command. The airship was also switched over from hydrogen to helium gas, which reduced payload but improved safety.3 KB (538 words) - 10:06, 10 February 2023
- ...ft "> 2 <td> [[Helium|He]] <td width="5%" > [[Helium/Atomic mass|{{:Helium/Atomic mass}}]] <td width="15%"> <td align="left "> 39 <td> [[Yttrium|18 KB (2,483 words) - 09:47, 6 March 2024
- ...bacterial strains or sperm samples. It is also used, usually with liquid helium, to cool superconducting magnetic materials for a variety of instruments in3 KB (539 words) - 18:53, 5 January 2021
- ...f our Sun can continue to burn each element synthesised in turn, hydrogen, helium, then [[carbon]], [[oxygen]], [[silicon]] and so forth until they are left4 KB (664 words) - 16:43, 28 November 2010
- ...e day you walk into a laboratory and there are all these pipes, and liquid helium is flowing, and currents are coming in and out with complicated wiring, and5 KB (690 words) - 17:36, 28 June 2012
- ...pe within a teletherapy unit; x-rays, electrons, protons, alpha particles (helium ions) and heavy charged ions, produced by particle acceleration; and neutro5 KB (653 words) - 14:16, 22 June 2010
- *Other gases: [[nitrogen]] (N<sub>2</sub>) and [[helium]] (He). ...distillation|distillation]]. This process can be modified to also recover helium, if desired.11 KB (1,750 words) - 09:37, 6 March 2024
- ...a very active variable star. As a star of low mass it converts hydrogen to helium very slowly compared to our own star. Sol. This slow conversion creates a t5 KB (794 words) - 18:54, 20 December 2007
- |align=center| [[Helium|He]] ||align=center| 2702.7 ||align=center| 3.7 E-4||align=center| 14.97 E4 ...b>2</sub>]] || align=center| [[Nitrogen|N<sub>2</sub>]] || align=center| [[Helium|He]] || align=center| [[Neon|Ne]] || align=center| [[Argon|Ar]] || align=ce11 KB (1,729 words) - 05:20, 3 September 2013
- ...a particles produced per second and one only has to measure the volume of helium gas produced per unit of time to know the number of atoms per volume, i.e., ...pp. 586-604 (1911)</ref> The first experiment gave 6.58 mm<sup>3</sup> of helium gas at 0°C and 760 mm pressure, while the second gave gave 10.38 mm<sup>3<19 KB (2,947 words) - 20:20, 27 December 2020
- ...ments using a sheet of gold foil through which were fired alpha particles (helium nuclei containing two positive charges)<ref> see [[Alpha decay]]</ref><ref> ...is in fact a stream of particles, as Rutherford discovered later in 1908, helium atoms without their two electrons. Beta radiation is a stream of electrons.10 KB (1,594 words) - 09:11, 12 October 2013
- <tr><td> He <td> [[Helium]] <td align="right"> 28 KB (1,135 words) - 09:15, 6 March 2024
- ...m takes place in this environment, they claim the main product is ordinary helium and heat, which are produced in the same ratio as they are with plasma fusi ...heat and helium appear to be correlated, but the nuclear process producing helium is still to be determined.27 KB (4,108 words) - 00:45, 8 October 2013
- <tr><td>2 <td>He <td>[[Helium]] <td bgcolor="#D0D0D0">2 <td>21 KB (3,868 words) - 09:15, 6 March 2024
- ...ic meter vs 1.0 kg per cubic meter at sea level). The primary advantage of helium is that it non-flammable whereas hydrogen burns readily in air. ...United States (until then the sole producer) was also unwilling to export helium because it was rare and was considered a strategic material. However, moder23 KB (3,524 words) - 07:41, 12 April 2014
- |align=center| [[Helium|He]] ||align=center| 2702.7 ||align=center| 3.7 E-4||align=center| 14.97 E4 ...b>2</sub>]] || align=center| [[Nitrogen|N<sub>2</sub>]] || align=center| [[Helium|He]] || align=center| [[Neon|Ne]] || align=center| [[Argon|Ar]] || align=ce13 KB (2,084 words) - 05:21, 3 September 2013
- ...t stars of spectral class ''F'' or ''G'' that are rich in [[carbon]] and [[helium]] content but poor in [[hydrogen]]. ...relatively low mass star exhausts the hydrogen in its core and starts the helium-to-carbon conversion in its interior instead.18 KB (2,830 words) - 10:19, 9 June 2008
- ...extremely low abundance of metals, or any element heavier than hydrogen or helium, and is very old; Weiss calculates an age of roughly 10 billion years. It i ...ar too small and irradiated to hold onto its primordial [[Hydrogen]] and [[Helium]] envelope. However, the composition of the planet varies greatly between t13 KB (1,765 words) - 11:12, 23 July 2022
- ...bundant element in the universe,<ref>In the following order: hydrogen (H), helium (He), and oxygen (O) and carbon (C)</ref> and it is literally the building5 KB (806 words) - 17:16, 1 January 2021
- ...atom of that element. Thus, the first six chemical elements, hydrogen, [[helium]], [[lithium]], [[boron]], [[nitrogen]] and [[carbon]] have 1, 2, 3, 4, 5 a5 KB (829 words) - 21:52, 21 July 2020
- ...23, p. 77-88.</ref> and Strutt<ref>Strutt R.J., 1909, The accumulation of helium in geologic time III. Proceeding of the Royal Society of London A, v. 83, p6 KB (831 words) - 06:31, 9 June 2009
- ...1.3 and 0.69 g/cc, respectively. Composed mainly of the gases hydrogen and helium. ...ammonia, with a small rocky core and an atmosphere of mostly hydrogen and helium.12 KB (1,829 words) - 10:07, 10 January 2021
- It is composed largely of [[hydrogen]] and [[helium]]. Jupiter's strong internal heat creates a number of semi-permanent featu6 KB (921 words) - 08:26, 10 January 2021
- ...yers of the atmosphere. Neptune is comprised predominantly of hydrogen and helium. However, its methane component reaches the upper atmosphere absorbing red6 KB (904 words) - 19:12, 9 January 2021
- '''p.11''' "The off-gas processing system uses helium sweep gas to entrain Xe and Kr gasses, passing them slowly through the off- ...ction in the nickel creating helium gas in the nickel. Annealing makes the helium migrate to grain boundaries, making it more brittle. Also not limiting."<br18 KB (2,734 words) - 13:11, 8 August 2023
- ...ations of matter at low temperatures which led to the production of liquid helium <td rowspan="1"> For theories for condensed matter, especially liquid helium30 KB (3,679 words) - 09:07, 12 October 2013
- ...o use [[hydrogen]] as the lift gas, despite the fact that hydrogen, unlike helium, is extremely flammable.<ref name="botting"> Botting 2001, p. 249-251.</ref ...d fire accidents had never occurred on civil zeppelins, so the switch from helium to hydrogen did not cause much alarm. Hydrogen also gave the craft about 8%26 KB (4,090 words) - 07:31, 20 April 2024
- ...a process that synthesises [[helium]]. When the hydrogen is consumed, the helium is then burned and that in turn synthesises carbon. To continue to burn fue14 KB (2,338 words) - 10:18, 23 November 2011
- ...red and tested. On September 19th (during a short period without beam), a helium enclosure was punctured due to the quench of a superconductor during electr6 KB (918 words) - 23:16, 25 March 2011
- ...d to either anti-inflammatory treatment and splinting after eight weeks or Helium-Neon laser treatment after six months" according to a [[meta-analysis]] by7 KB (999 words) - 19:15, 2 October 2013
- <tr><td>[[Helium]]-3</td><td><sup>3</sup>He</td><td>-1/2</td><td> - </td>12 KB (1,860 words) - 09:15, 6 March 2024
- ...ica]]'' noting that the almost complete absence of elements heavier than [[Helium]] in the early Universe meant stars could be much more massive than stars t11 KB (1,395 words) - 20:30, 30 March 2022
- The atmosphere is composed of mainly of [[hydrogen]] and [[helium]] and has a temperature of about -216 °C.<ref> -357 °F; 57 K</ref> Its at8 KB (1,202 words) - 08:50, 10 January 2021
- ...distribution of the light nuclear isotopes hydrogen, deuterium, helium-3, helium-17 KB (2,731 words) - 19:52, 26 October 2020
- These magnetometers require cooling with liquid [[helium]] (4.2 K) or liquid [[nitrogen]] (77 K) to operate, hence the pac9 KB (1,370 words) - 08:18, 12 September 2013
- ...compose dark matter then the early universe would have had to produce more helium and deuterium than could possibly exist. Possible types of DM are:10 KB (1,526 words) - 19:36, 18 August 2020
- ...etre as 1 579 800.762046±(3.3 ×10<sup>−5</sup>) wavelengths of helium-neon laser light in vacuum, for example, and converting the wavelengths in ...tre, and any [[partial vacuum]] can be used, or some inert atmosphere like helium gas, provided the appropriate corrections for refractive index are implemen34 KB (5,178 words) - 10:12, 28 February 2024
- ...r hydrogen, [[lithium]], [[beryllium]], and [[borium]], which strive for a helium configuration of two electrons (a duplet), it means that most atoms try to ...In the first molecule (methane, CH<sub>4</sub>) the hydrogen atoms have a helium electronic configuration (are surrounded by two electrons) and the carbon h37 KB (5,836 words) - 05:36, 6 March 2024
- ...o the [[liquefaction]] of [[hydrogen]] by [[James Dewar]] in 1898 and of [[helium]] by [[Heike Kamerlingh Onnes]] in 1908.10 KB (1,520 words) - 09:14, 2 March 2024
- ...the infamous Hindenburg disaster in 1937. Airships now use helium instead. Helium is chemically inert, so safer than hydrogen, but also more expensive and he20 KB (3,081 words) - 21:57, 31 March 2022
- ...o the [[liquefaction]] of [[hydrogen]] by [[James Dewar]] in 1898 and of [[helium]] by [[Heike Kamerlingh Onnes]] in 1908.10 KB (1,521 words) - 09:14, 2 March 2024
- ...oons, or "cells", contained the [[lighter-than-air]] gas [[hydrogen]] or [[helium]]. Non-rigid airships do not have multiple gas cells. Motive power was prov ...in technology considerably, and was intended to be filled with [[inert]] [[helium]].36 KB (5,621 words) - 07:33, 20 April 2024
- ...]] of 87.74 years and decays to uranium-234 by emitting α-particles (helium nuclei).10 KB (1,406 words) - 17:02, 22 March 2024
- ...cal elements, even if they do not recognize them as such. They include: [[helium]] (He), used to make party balloons float; [[lithium]] (Li), used to make b ...ericium]] <td align="right"> 95 <td width="15%"><td>He<td width="5%" >[[Helium]] <td align="right"> 2<td width="15%"> <td>Pu <td width="5%" >[[Plut39 KB (5,559 words) - 09:16, 6 March 2024
- ...f [[noble gas]]es, first observed (1908) by [[Heike Kamerlingh Onnes]] for helium, were very puzzling, as these effects could not be explained at all by cla ..., even for [[noble gas]] atoms. In fact, the dispersion force explains why helium gas can be liquefied. The dispersion force is often explained as due to an56 KB (8,720 words) - 07:31, 20 April 2024
- |[[Helium]]|| align="center"|He|| align="center"|0.000520|| align="center"|5.2012 KB (1,867 words) - 08:51, 30 June 2023
- ...ore, they are inflated exclusively with the non-flammable [[noble gas]] [[helium]].10 KB (1,471 words) - 07:38, 9 June 2009
- ...ning out" of droplets of helium deep in Saturn's interior, the droplets of helium releasing heat by friction as they fall down through the lighter hydrogen.23 KB (3,601 words) - 18:46, 13 January 2021
- ...lure, there is a gap between the fuel and cladding. The gap is filled with helium gas for thermal bonding. If burnup is too high, however, the swelling and/o12 KB (1,882 words) - 11:17, 21 April 2024
- <tr><td>[[Helium]]-3</td><td><sup>3</sup>He</td><td>-1/2</td><td> - </td>15 KB (2,459 words) - 17:02, 7 March 2024
- ...abundant [[Chemical element|element]] in the universe (after hydrogen and helium) and the most abundant element of the [[lithosphere]] (about 47% of [[Earth12 KB (1,791 words) - 05:43, 6 March 2024
- | 2 || He || [[helium]]17 KB (2,246 words) - 09:16, 6 March 2024
- ...erred to as pentanes<sup>+ </sup>), elemental [[sulphur]], and sometimes [[helium]] and [[nitrogen]]. *Other gases: [[nitrogen]] (N<sub>2</sub>) and [[helium]] (He).26 KB (3,931 words) - 09:37, 6 March 2024
- ...erred to as pentanes<sup>+ </sup>), elemental [[sulphur]], and sometimes [[helium]] and [[nitrogen]]. *Other gases: [[nitrogen]] (N<sub>2</sub>) and [[helium]] (He).26 KB (3,927 words) - 09:37, 6 March 2024
- ...ults. For an atom that only has occupied ''s'' orbitals, like hydrogen and helium, polarization functions start at ''l'' = 1. For atoms such as boron with o14 KB (2,265 words) - 05:37, 6 March 2024
- ...gether than in a gas, so are considerably denser than gases such as air or helium. ...e around 10 times denser than water, which is 800 times denser than air. [[Helium]] is roughly 1/7 the density of air.45 KB (6,572 words) - 12:36, 9 March 2024
- ...>4</sub>]] oxidizer and [[MMH]] fuel. They were pressurized by 0.5 kg of [[helium]] stored at 28.6 MPa in two tanks. The central tunnel housed the service propulsion engine and its two helium pressurant tanks. The engine used [[Aerozine 50]] ([[hydrazine]]/UDMH) fuel24 KB (3,494 words) - 07:31, 20 April 2024
- ...ly by a few centimetres in air or a piece of paper, and is equivalent to a helium nucleus. Beta radiation can be blocked by an aluminium sheet just a few mil13 KB (2,007 words) - 09:16, 6 March 2024
- A water content reduction purification stage using HF and helium sweep gas was specified to run at 400 °C. Oxide and sulfur contaminat ...es in excess of 750 °C); better electric conversion efficiency than a helium-cooled VHTR operating in similar conditions; [[passive nuclear safety|passi38 KB (5,549 words) - 12:55, 15 March 2024
- ...]</ref> the liquefaction of [[gases]] (such as [[oxygen]], [[nitrogen]], [[helium]], [[argon]] and [[krypton]])<ref>[http://www.nzic.org.nz/ChemProcesses/pro16 KB (2,411 words) - 09:37, 6 March 2024
- ...nanoscale device]]s. Also, as the temperature is lowered to absolute zero, helium remains a liquid, rather than freezing to a solid, owing to the irremovable16 KB (2,522 words) - 14:33, 14 May 2023
- Consider, as an example, the excited [[helium]] atom in the [[atomic electron configuration]] 2''p''3''p''. By the [[Angu22 KB (3,334 words) - 05:36, 6 March 2024
- ...mpose dark matter then the early universe would have had to produce more [[helium]] and [[deuterium]] than could possibly exist—not enough room for all of18 KB (2,817 words) - 20:15, 27 October 2020
- ...the core. The resulting [[red giant]] enjoys a brief life span before the helium fuel is in turn consumed. Very massive stars can also undergo a series of s46 KB (6,796 words) - 10:08, 28 February 2024
- The [[quantum gas]]es [[hydrogen]], [[helium]], and [[neon]] do not conform to the corresponding-states behavior and the23 KB (3,685 words) - 10:47, 9 September 2023
- The [[quantum gas]]es [[hydrogen]], [[helium]], and [[neon]] do not conform to the corresponding-states behavior and the23 KB (3,702 words) - 10:47, 9 September 2023
- Calculations of the ratios of hydrogen and helium within the Sun suggest it is halfway through its life cycle. It will event ...85 | year=1973 | pages=477–498 }}</ref> Elements heavier than hydrogen and helium were formed in the cores of ancient and exploding stars, so the first gener76 KB (11,605 words) - 21:48, 1 September 2020
- ...on of [[Gas|gases]] such as [[hydrogen]], [[oxygen]], [[nitrogen]], and [[helium]]), and other low-temperature processing.21 KB (3,308 words) - 09:16, 6 March 2024
- ...orbital approximation can be extended to understand the other atoms e.g. [[helium]], [[lithium]] and [[carbon]].22 KB (3,143 words) - 09:41, 6 March 2024
- ...lei of lighter elements (e.g., hydrogen isotopes) into a heavier one (e.g.,helium).20 KB (3,072 words) - 10:33, 18 March 2024
- |[[Helium]]|| align="center"|He|| align="center"|0.000520|| align="center"|5.2022 KB (3,363 words) - 19:40, 9 January 2021
- ...d the lid on, then dewatered completely, vacuum dried, and backfilled with helium for corrosion control. TSC was then transferred from the transfer cask to t19 KB (2,949 words) - 20:17, 13 March 2024
- ...orbital approximation can be extended to understand the other atoms e.g. [[helium]], [[lithium]] and [[carbon]].23 KB (3,309 words) - 09:41, 6 March 2024
- ...as-cooled Reactor|High Temperature Gas-cooled Reactors]] (HTGRs) use inert helium gas as a coolant and can provide temperatures even higher than MSRs. These23 KB (3,486 words) - 09:11, 19 April 2024
- ...med. It is normal to fill the gap between the fuel and the cladding with [[helium]] gas to permit better thermal contact between the fuel and the cladding. D26 KB (4,299 words) - 04:37, 22 March 2014
- ...ub>), any residual water liquid or vapor, [[mercury]], [[nitrogen]], and [[helium]] which could cause difficulty downstream. (See the block flow diagram of t24 KB (3,746 words) - 09:37, 6 March 2024
- [[Gas-cooled fast reactor]]s have been the subject of research commonly using helium, which has small absorption and scattering cross sections, thus preserving35 KB (5,379 words) - 12:53, 15 March 2024
- * [[Helium]]25 KB (3,396 words) - 13:29, 2 April 2024
- ...ke atom|hydrogen atom]] are the most important representatives. Even the [[helium]] atom, which contains just one more electron than hydrogen, defies all att37 KB (5,578 words) - 04:54, 21 March 2024
- ...olutions that developed included the use of [[hydrogen]], [[argon]], and [[helium]] as welding atmospheres.<ref name=Cary/> During the following decade, furt41 KB (6,367 words) - 05:51, 12 September 2013