Mining in Manitoba
Composition of Air
Mine Development
Pure, dry, normal air has the following composition:
| Respiratory | |||||
| Accurate | Analysis | Effects | Mine | Ventilation | |
| By Vol. | By Wt. | By Vol | By Vol | By Wt | |
| Oxygen | 20.93 | 23.02 | 20.93 | 21 | 23 |
| CO2 | 0.03 | 0.04 | 0.03 | - | - |
| Nitrogen | 78.10 | 75.50 | 79.04 | 79 | 77 |
| Argon | 0.94 | 1.44 | - | - | - |
| Total | 100.00 | 100.00 | 100.00 | 100.00 | 100.00 |
These percentages are lowered by
water vapour present in the air. In most calculations concerning ventilation of mines, air
is considered to be composed of 2 gases only.
