Search results

<tr><td> He <td> [[Helium]] <td align="right"> 2

...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.

...4He) (24% of total mass) and trace amounts of the isotopes deuterium (2H), helium-3 (3He) and lithium (7Li). Subsequently the interstellar medium within gala

<tr><td>2 <td>He <td>[[Helium]] <td bgcolor="#D0D0D0">2 <td>

...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, moder

...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.

|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|N₂]] || align=center| [[Helium|He]] || align=center| [[Neon|Ne]] || align=center| [[Argon|Ar]] || align=ce

...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 t

...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 building

...atom of that element. Thus, the first six chemical elements, hydrogen, [[helium]], [[lithium]], [[boron]], [[nitrogen]] and [[carbon]] have 1, 2, 3, 4, 5 a

...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, p

...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.

It is composed largely of [[hydrogen]] and [[helium]]. Jupiter's strong internal heat creates a number of semi-permanent featu

...plunged into a long, dark winter. Uranus is a ball of mostly hydrogen and helium. Absorption of red light by methane in the atmosphere gives the planet its

'''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."<br

...yers of the atmosphere. Neptune is comprised predominantly of hydrogen and helium. However, its methane component reaches the upper atmosphere absorbing red

...ations of matter at low temperatures which led to the production of liquid helium <td rowspan="1"> For theories for condensed matter, especially liquid helium

...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 fue

...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%

...(a hydrogen ion, H⁺, positive charge), and [[alpha particle]] (helium ion, He²⁺, consisting of two protons and two neutrons) . A negat |Helium||He²⁺||(Alpha particle)