Gaseous hydrocarbon, colorless & unstable.
Acetylene (C2H2) is a gaseous hydrocarbon, colorless, unstable, highly combustible and with strong garlic odor. It is not an air gas and it produces a very hot flame (over 3000°C or 5400°C) when combined with oxygen.
| Appearance | Colourless gas |
| Auto Ignition Temperature | 305°C (581°F) |
| Critical Temperature | 35.25°C (95.5°F) |
| Flammability | Extremely flammable in the presence of the following materials or conditions: open flames, sparks and static discharge, heat and oxidizing materials |
| Molecular Mass | 26.04 g/mole |
| Odor | Mild. Ethereal. |
| Phase | Gas |
| Vapour Pressure | 635 (psig) |