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

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

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Engineering Thermodynamics
The efficiency of a gas turbine is given by

(Isentropic increase in temperature)/(Actual increase in temperature)
(Net work output)/(Work-done by the turbine)
(Net work output)/(Heat supplied)
(Actual temperature drop)/(Isentropic temperature drop)

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