Engineering Thermodynamics
Producer gas is obtained by

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

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Engineering Thermodynamics
According to Avogadro's law, for a given pressure and temperature, each molecule of a gas

Occupies same volume
Occupies volume inversely proportional to its molecular weight
Occupies volume inversely proportional to its specific weight
Occupies volume proportional to its specific weight

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Engineering Thermodynamics
According to Clausius statement of second law of thermodynamics

Heat can be transferred for low temperature to high temperature source by using refrigeration cycle
Heat can be transferred from low temperature to high temperature source if COP of process is more than unity
Heat can
Heat can

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