Engineering Thermodynamics
If a gas vapour is allowed to expand through a very minute aperture, then such a process is known as

Throttling
Free expansion
Adiabatic expansion
Hyperbolic expansion

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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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Engineering Thermodynamics
The universal gas constant (or molar constant) of a gas is the product of

Molecular mass of the gas and the specific heat at constant pressure
Molecular mass of the gas and the specific heat at constant volume
Molecular mass of the gas and the gas constant
Atomic mass of the gas and the gas constant

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