HELIUM He
General Characteristics
Helium is a colorless, odorless, nontoxic, nonflammable gas that is lighter than air. It is shipped in steel cylinders under high pressure.
Physical Information
Molecular Weight
4.0026
Flammability Limits in air
Nonflammable
Specific Gravity,
Gas @ 70&degF(21.1&degC),
1 atm(Air=1)
0.14
Density,
Gas @ 70&degF
(21.1&degC), 1 atm
0.0104lbs/ft^3 (0.167kg/m^3)
Specific Volume,
Gas @ 70&degF
(21.1&degC), 1 atm
96.6ft^3/lb (6.03l/g)
Boiling Point @ 1 atm
-452.1&degF (-268.94&degC)
Critical Temperature
-450.3&degF (-268.0&degC)
Critical Pressure
33.2 psia (2.29 bar)
Toxicity
Non-Toxic, asphyxiant only