AS 3 Lecture Screens Temperature is a measure of the speed of the molecules in a substance. Temperature is also an indicator of the amount of energy in the air, and the transport of energy is what weather is about. Pressure is the force exerted by the gases in the atmosphere against the Earth. Differences in pressure between locations result in winds. Water vapor is required to form clouds and precipitation, and also participates in the atmospheric energy transport.
Wind is the motion of air, characterized by speed and direction.
The movement of air accomplishes transport of water vapor and energy. Clouds result from the condensation of water vapor into liquid water droplets or ice crystals. Clouds can shade the surface of the Earth, cooling it, and produce precipitation , which is the return of water substance to the Earth's surface from the atmosphere.