Engineering Thermodynamics
A diathermic wall is one which

Permits thermal interaction
Discourages thermal interaction
Prevents thermal interaction
Encourages thermal interaction

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

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