Engineering Thermodynamics
Brayton cycle consists' of following four processes

Two isentropic and two constant volumes
Two isothermal and two isentropic
Two isentropic, one constant volume and one constant pressure
Two isentropic and two constant pressures

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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 specific weight
Occupies volume inversely proportional to its molecular weight

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