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Physical Properties for Helium
| Formula |
He |
| Molecular Weight (lb/mol) |
4.00 |
| Critical Temp. (°F) |
-450.3 |
| Critical Pressure (psia) |
33.0 |
| Boiling Point (°F) |
-452.1 |
| Melting Point (°F) |
-- |
| Psat @ 70°F (psia) |
(note 1) |
| Liquid Density @ 70°F (lb/ft3) |
(note 1) |
| Gas Density @ 70°F 1 atm (lb/ft3) |
.0103 |
| Specific Volume @ 70°F 1 atm (ft3/lb) |
96.65 |
| Specific Gravity |
0.138 |
| Specific Heat @ 70°F (Btu/lbmol-°F) |
4.97 |
Notes:
1 = Signifies at 70°F, the compound is above its critical temperature.
2 = Signifies that at 70°F, the compound is below the normal boiling
point and only the equilibrium vapor is present at 1 atmosphere.
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