Helium

He · Z 2

atomic number: 2
atomic mass: 4.0026
notation: He
group: 18: Helium/Neon
period: 1
state0c: Gas
state20c: Gas
occurrence: Primordial
density: 0.0001785
melting pt: -272.2
boiling pt: -268.93
discovered: 1868
abundance: 0.008
ore grade: 1300
ore minerals: in natural gas from a few reservoirs, up to several percent
mined as: By-product

extraction

Helium leaks from decaying uranium and thorium and collects in gas traps under a good seal. It is separated cryogenically from natural gas — the methane liquefies, the helium does not — and purified by pressure-swing adsorption. A few fields in Texas, Qatar, Algeria and Russia supply the world.

mines

Bush Dome / Cliffside Ras Laffan

machines

Stirling Engine

equations

Schrödinger Equation Rutherford Scattering Mass–Energy Equivalence Lawson Criterion Ideal Gas Law Graham's Law of Effusion Van der Waals Equation Newton–Laplace Speed of Sound Equipartition Theorem Laser Rate Equations Gaussian Beam Divergence Stefan–Boltzmann Law First Friedmann Equation Third Law of Thermodynamics

Referenced by

equation

Equipartition Theorem First Friedmann Equation Gaussian Beam Divergence Graham's Law of Effusion Ideal Gas Law Laser Rate Equations Lawson Criterion Mass–Energy Equivalence Newton–Laplace Speed of Sound Rutherford Scattering Schrödinger Equation Stefan–Boltzmann Law Third Law of Thermodynamics Van der Waals Equation

machine

Stirling Engine

mine