Engineering Thermodynamics
The specific heat at constant volume is

The amount of heat required to raise the temperature of 1 kg of water through one degree
The amount of heat required to raise the temperature of unit mass of gas through one degree, at constant volume
The amount of heat required to raise the temperature of unit mass of gas through one degree, at constant pressure
Any one of the above

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Engineering Thermodynamics
Producer gas is obtained by

Passing steam over incandescent coke
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

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