an ice cube is melted in water which is continuously stirred to be at a constant temperature of 0 degrees. the stirring is gentle enough so the work done is negligible.
my question is why in this case does the heat come from the air to melt the ice cube and not the water. why cant it be a bit of both or just the water.
also, for the total entropy change of the universe, wouldn't I just consider the S:ice + S:water = S:air?