Chemical, Physical and Thermal Properties of Helium - He
Chemical, physical and thermal properties of Helium - He :
(values at 25oC (77oF, 298 K) and atmospheric pressure)
| Molecular Weight | 4.0026 |
| Specific Gravity, air = 1 | 0.138 |
| Specific Volume (ft3/lb, m3/kg) | 97.86, 6.11 |
| Density of liquid at atmospheric pressure (lb/ft3, kg/m3) | 7.80, 125 |
| Absolute Viscosity (lbm/ft s, centipoises) | 13.4 10-6, 0.02 |
| Sound velocity in gas (m/s) | 1015 |
| Specific Heat - cp - (Btu/lboF or cal/goC, J/kgK) | 1.24, 5188 |
| Specific Heat Ratio - cp/cv | 1.66 |
| Gas constant - R - (ft lb/lboR, J/kgoC) | 386, 2077 |
| Thermal Conductivity (Btu/hr ft oF, W/moC) | 0.086, 0.149 |
| Boiling Point - saturation pressure 14.7 psia and 760 mm Hg - (oF, oK) | -452, 4.22 |
| Latent Heat of Evaporation at boiling point (Btu/lb, J/kg) | 10.0, 23300 |
| Critical Temperature (oF, oK) | -450.3, 5.2 |
| Critical Pressure (psia, MN/m2) | 33.22, - |
| Critical Volume (ft3/lb, m3/kg) | 0.231, 0.0144 |
| Flammable | no |
Isotope data for helium-6 in the Periodic Table Isotopes of Helium (click to see decay chain): 2 He 3 He 4 He 5 He 6 He 7 He 8 He 9 He 10 He. ››More information on molar mass and molecular weight. In chemistry, the formula weight is a quantity computed by multiplying the atomic weight (in atomic mass units) of each element in a chemical formula by the number of atoms of that element present in the formula, then adding all of these products together.
- From Wikipedia, the free encyclopedia Lithium-6 – deuterium fusion reaction: an aneutronic fusion reaction, with energy released carried by alpha particles, not neutrons. Aneutronic fusion is any form of fusion power in which very little of the energy released is carried by neutrons.
- Like most blockchains, Helium has a system of transaction fees. All transactions in the Helium blockchain are paid in Data Credits (DCs). Data Credits are produced via burning some amount of HNT using an on-chain transaction. And thanks to a system called 'Implicit Burn', users (typically) don't need to manually supply DCs to pay fees.
- Helium He Transportation Information UN Number: 1046 Shipping NameHelium,Helium, Helium, Compressed Compressed Compressed Hazard Class2.12.12.1 Label Nonflammable Nonflammable Nonflammable GasGasGas (M)SDS Reference P-4602 CAS Number 7440 - 59 - 7 General Description Colorless, odorless, nonflammable inert gas. United States of America Canada.
Follow the links below to get values for the listed properties of helium at varying pressure and temperature:
See also more about atmospheric pressure, and STP - Standard Temperature and Pressure & NTP - Normal Temperature and Pressure,
as well as Thermophysical properties of: Acetone, Acetylene, Air, Ammonia, Argon, Benzene, Butane, Carbon dioxide, Carbon monoxide, Ethane, Ethanol, Ethylene, Hydrogen, Hydrogen sulfide, Methane, Methanol, Nitrogen, Oxygen, Pentane, Propane, Toluene, Water and Heavy water, D2O.
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