Geography

What is Air Pressure?

What is Air Pressure?

General purpose of this lecture is to present on What is Air Pressure. Air pressure is the weight of the atmosphere pressing down on the earth. It is measured by a barometer in units called millibars. Most barometers use mercury in a glass column, like a thermometer, to measure the change in air pressure. here also briefly focus on what is the constant motion of air molecules in all directions.