The weather is very hot. Xiaohong looked at the thermometer hanging on the wall. It was 34 degrees Celsius. When she turned on the fan, it was immediately cool, but the temperature of the thermometer did not change. Why?

The weather is very hot. Xiaohong is doing her homework at home, sweating profusely and looking up at the thermometer hanging on the wall. At that time, the room temperature was 3 1 celsius. So she turned on the electric fan and it was much cooler at once. At this time, she looked at the thermometer again and found the indication (constant) (choose "increase", "constant" or "decrease"), because the electric fan is turned on to accelerate (air flow) and accelerate (sweat evaporation) unchanged (room temperature). At this point, if you wrap the thermometer bubble with a wet cloth, you will find that (the pointer of the thermometer becomes smaller)