Engineering Thermodynamics
A diathermic wall is one which

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

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Engineering Thermodynamics
Extensive property of a system is one whose value

Depends on the mass of the system like volume
Does not depend on the mass of the system, like temperature, pressure, etc.
Is dependent on the path followed and not on the state
Is not dependent on the path followed but on the state

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