
As gas molecules are always moving in every direction, air pressure is the same in all directions.

Automated Surface Observing Systems monitor weather conditions at many airports.Measuring surface air temperature at U.S.More precise thermometers measure air temperature by checking how much electricity can pass through a sample of pure metal. The most common type of thermometer is the liquid-in-glass thermometer. Thermometers, shielded from direct solar energy, are used to measure surface air temperature.

Surface air temperature is the temperature of the air around us, generally measured at a height of around two meters (about 6 and a half feet) above the surface.
