The contents of Inert gas are:
- Sulphur dioxide (SO 2) – 50 ppm
- Carbon monoxide (CO) – trace
- Nitrogen oxide (NO) – trace
- Water vapour (H2O) – trace
- Ash and shoot – trace
- Density – 1.044
- Nitrogen – 83 %
- Carbon dioxide – 12-14 %
- Oxygen – 2-4 %
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