The 2 factors on which friction two body is depended upon The mass of the body, the coefficient of Static or limiting or dynamic friction( as the case may be)
the amount of insolation received @ a given point on the earth's surface depends on the angle @ which the sun's rays strike the earth and the number of daylight hours. also the amount of water vapor...
First, there has to be water available to evaporate. Second, the warmer the temperature, the faster the water evaporates. This means that if water is available, warm air will take on more water vapor...
Humidity is largely a function of heat and pressure. Humidity is water vapor in the air. Heat drives water molecules into the air above the water. How many molecules are suspended
depends on the heat...