Engineering Thermodynamics
Producer gas is obtained by

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

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Engineering Thermodynamics
According to Avogadro’s law

The product of the gas constant and the molecular mass of an ideal gas is constant
The sum of partial pressure of the mixture of two gases is sum of the two
All of these
Equal volumes of all gases, at the same temperature and pressure, contain equal number of molecules

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