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

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

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Engineering Thermodynamics
The condition for the reversibility of a cycle is

The working parts of the engine must be friction free
All the processes, taking place in the cycle of operation, must be extremely slow
All of these
The pressure and temperature of the working substance must not differ, appreciably, from those of the surroundings at any stage in the process

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