Engineering Thermodynamics
Temperature of a gas is produced due to

Repulsion of molecules
Kinetic energy of molecules
Surface tension of molecules
Its heating value

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Engineering Thermodynamics
Mond gas is obtained by

Passing air and a large amount of steam over waste coal at about 650°C
Partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast
Passing steam over incandescent coke
Carbonisation of bituminous coal

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