Engineering Thermodynamics
The air standard efficiency of an Otto cycle is given by (where r = Compression ratio, and γ = Ratio of specific heats)

1 - rγ - 1
1 - (1/ rγ - 1)
1 + (1/ rγ - 1)
1 + rγ - 1

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

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

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