Chemistry
Water gas is the mixture of

Carbon monoxide and hydrogen
Carbon dioxide and nitrogen
Carbon monoxide and nitrogen
Carbon dioxide and hydrogen

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Chemistry
The open "Sigrees" or coal stoves often require fanning to sustain burning because of

Accumulation of smoke and dust over the sigrees
Tendency of carbon dioxide to form a layer along with dust smoke
Lack of oxygen in the surroundings of sigrees
Interrupted release of moisture from the material

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