Engineering Thermodynamics
According to Dalton's law, the total pressure of the mixture of gases is equal to

Sum of the partial pressures of all
Sum of the partial pressures of all divided by average molecular weight
Greater of the partial pressures of all
Average of the partial pressures of all

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Engineering Thermodynamics
Producer gas is obtained by

Carbonization of bituminous coal
Passing air and a large amount of steam over waste coal at about 650°C
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
Zeroth law of thermodynamics

Deals with heat engines
Deals with conversion of mass and energy
Deals with reversibility and irreversibility of process
States that if two systems are both in equilibrium with a third system, they are in thermal equilibrium with each other

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