The weather is very hot. Xiaohong looked at the thermometer at home. As shown in the figure, the temperature at that time was _ _ _ _℃. She turned on the electric fan and immediately felt much cooler.

(1) On the thermometer, there are five grids between 10℃, and one grid represents 2℃, so the scale value of this thermometer is 2℃; "30" is below "40" and the highest liquid column is between the two, indicating that the temperature is higher than 0℃, which is 34℃;

Turning on the electric fan immediately made her feel much cooler. She looked at the thermometer again and found that the pointer had not changed. The reason why she feels cool is that turning on the electric fan speeds up the air flow, accelerates the evaporation of body sweat and absorbs more heat.

So the answer is: 34; Constant; Speed up the air flow.