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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 ob

...egularities that were observed in the spectra of atomic [[hydrogen]] and [[helium]]. Initially they thought that electrons rotate physically about an axis, h

...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;

or to a helium isotope and emit a neutron:

{{r|Helium}}

...he looming war prevented German access to the required large quantities of helium, leading to the conversion of the Hindenburg to a hydrogen design. However

*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), an

...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

...crease can be obtained by cooling the electronic components to near liquid helium temperatures, which greatly decreases electronic noise.

...electrodynamics]], the physics of the superfluidity of supercooled liquid helium, and particle theory. His work on quantum electrodynamics made him a joint

.... Pierce]] in command. The airship was also switched over from hydrogen to helium gas, which reduced payload but improved safety.

...ft "> 2 <td> [[Helium|He]] <td width="5%" > [[Helium/Atomic mass|{{:Helium/Atomic mass}}]] <td width="15%"> <td align="left "> 39 <td> [[Yttrium|

...bacterial strains or sperm samples. It is also used, usually with liquid helium, to cool superconducting magnetic materials for a variety of instruments in

...f our Sun can continue to burn each element synthesised in turn, hydrogen, helium, then [[carbon]], [[oxygen]], [[silicon]] and so forth until they are left

...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, and

...pe within a teletherapy unit; x-rays, electrons, protons, alpha particles (helium ions) and heavy charged ions, produced by particle acceleration; and neutro

*Other gases: [[nitrogen]] (N₂) and [[helium]] (He). ...distillation|distillation]]. This process can be modified to also recover helium, if desired.

...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 t

|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

...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 mm³ of helium gas at 0°C and 760 mm pressure, while the second gave gave 10.38 mm<sup>3<