| 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 Properties |
| Molecular Weight |
4.0026 |
| Flammability Limits in air |
Nonflammable |
Specific Gravity,
Gas @ 70°F(21.1°C), 1 atm(Air=1) |
0.14 |
Density,
Gas @ 70°F(21.1°C), 1 atm |
0.0104lbs/ft^3 (0.167kg/m^3) |
| Specific Volume, Gas @ 70°F(21.1°C), 1 atm |
96.6ft^3/lb (6.03l/g) |
| Boiling Point @ 1 atm |
-452.1°F (-268.94°C) |
| Critical Temperature |
-450.3°F (-268.0°C) |
| Critical Pressure |
33.2 psia (2.29 bar) |
| Toxicity |
Non-Toxic, asphyxiant only |
