Rooms A and B are the same size, and are connected by an open door. Room A, however, is warmer (perhaps because its windows face the sun). Which room contains the greater mass of air? Explain carefully.

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The ideal gas law was originally stated as experimental result.

Where P is the pressure, V is the volume, n is the number moles of gas, T is the temperature in kelvin and R is the gas constant.

This the free body diagram