Engineering Thermodynamics
The basis for measuring thermodynamic property of temperature is given by

Third law of thermodynamics
First law of thermodynamics
Zeroth law of thermodynamics
Second law of thermodynamics

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Engineering Thermodynamics
Producer 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
Carbonization of bituminous coal
Passing steam over incandescent coke

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