Engineering Thermodynamics
A diathermic wall is one which

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

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Engineering Thermodynamics
According to Dalton's law, the total pressure of the mixture of gases is equal to

Sum of the partial pressures of all
Average of the partial pressures of all
Greater of the partial pressures of all
Sum of the partial pressures of all divided by average molecular weight

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