Question

Physcial chemistry

When the windows of a car fog over, what happens thermodynamically? Include discussion of any thermodynamic quantities you deem relevant.

(What happens for change in Pressure, temp, entropy, enthalpy, volume, heat, helmholtz, Gibbs and work?)

The system is the air inside the car and everything else (including the people inside of the car are the surroundings.

Answer 1

There is condensation

the "cold" window will abosrb the heat form the air, recall that the air is humidt, when T is decreased, then the air's humidity must be condensed, this is the little droplets of water which seems to us like "fog" in th ewindow.

The pressure remains the same, since constant pressure process

Entropy increases, for every forward process

Enthalpy of condensation is present, since the window must absorb enough energy to form liquid droplets