Engineering Thermodynamics
All perfect gases change in volume by 1/273th of its original volume at 0°C for every 1°C change in temperature, when the pressure remains constant. This statement is called

Charles' law
Gay-Lussac law
Joule's law
Boyle's law

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Engineering Thermodynamics
Producer gas is obtained by

Passing steam over incandescent coke
Carbonization 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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