Propane, butane & LPG
Propane is a gas compressed under pressure to a liquid and is colourless, odourless and flammable. Propane is heavier than air.
Propane has a lower boiling point (-42 °C) than butane and is therefore stored under a higher pressure. The boiling point of butane is about -0,5 °C, it is thus not usable in colder circumstances around this temperature.
Physicochemical constants
| Symbol | C3H8 |
|---|---|
| Average molecular weight (g/mol) | 44.01 |
| Density of the gas (kg/m3 at 1,013 bar and 0 °C) | 2,01 |
| Relative density of the gas (air=1) | 1.56 |
| Boiling point | -42.1 °C |
| Critical temperature | 96.7 °C |
| Vapour pressure (bar at 20 °C) | 8.367 |
| Self-ignition temperature | 2.2 - 9.5 |
1 litre liquid propane releases 270 litres gas at 15 °C and 1 bar.
Application areas
Safety information
See the safety information sheet (SDS) nr: 104 (gas compressed to liquid gas