Engineering Thermodynamics
Mond gas is obtained by

Passing steam over incandescent coke
Carbonisation of bituminous coal
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

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Engineering Thermodynamics
Zeroth law of thermodynamics

Deals with conversion of mass and energy
Deals with reversibility and irreversibility of process
Deals with heat engines
States that if two systems are both in equilibrium with a third system, they are in thermal equilibrium with each other

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