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

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Engineering Thermodynamics
The door of a running refrigerator inside a room was left open. Which of the following statements is correct?

The room will be cooled to the temperature inside the refrigerator
The room will be cooled very slightly
The temperature of the air in room will remain unaffected
The room will be gradually warmed up

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