1, temperature difference: if there is no temperature difference on the surface of the medium contacted by wet air, the air saturation will not change, and there will be no condensation; 2. Saturated moisture content of air: If the air is relatively dry, that is, the relative humidity is very low, even if there is a temperature difference, condensation will not occur if it does not reach the dew point after cooling.

Our life is inseparable from mathematics, and many real lives are pregnant with mathematical problems, or they can be explained by mathematical knowledge. For example, some students ski in TV sports programs or watch skiers ski. People may notice that skiers always keep two skateboards parallel to keep their balance and not fall. Also, nail a batten horizontally on the wall, and nail at least 2 nails. Tell me your reasons. Two points determine a straight line, and two straight lines intersect if they are not parallel. ..