Question

On a cold winter night the temperature is -5ºC (23ºF) and the relative humidity is 100%....

On a cold winter night the temperature is -5ºC (23ºF) and the relative humidity is 100%. Under these conditions, ice/snow on the ground and water vapor in the air are in equilibrium...no more ice will form (frost) nor will any ice/snow sublimate. Now suppose the air pressure increases, which disturbs this equilibrium. Consider the following possible processes which may occur in response to the change of pressure:

CASE-A: More ice forms as frost (1) and the water vapor in the air gets warmer (4). Can this happen, or does it violate the laws of thermodynamics?

it can happen

both laws violated    

2nd law violated

1st Law violated

CASE-B: More ice forms as frost (1) and the water vapor in the air gets colder (3). Can this happen, or does it violate the laws of thermodynamics?

2nd law violated

it can happen    

both laws violated

1st Law violated

CASE-C: Ice/snow sublimates (2) and the water vapor in the air gets colder (3). Can this happen, or does it violate the laws of thermodynamics?

it can happen

1st Law violated    

both laws violated

2nd law violated

CASE-D: Ice/snow sublimates (2) and the water vapor in the air gets warmer (4). Can this happen, or does it violate the laws of thermodynamics?

it can happen

1st law violated    

2nd Law violated

both laws violated

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