Atmospheric pressure is the force per unit of surface exerted by the air that forms the atmosphere on the earth's surface. The diagram shows the force exerted by a column of air on a square meter. This is equal to the equivalent pressure of an atmosphere.
Air pressure describes the weight of air that presses down on the earth's surface. The diagram explains the concept of air pressure (option D).
What is air pressure?
The term air pressure describes the weight of air that presses down on the earth's surface. We can see from the diagram that there is a mass of air that is pressing heavily down on the surface.
This mass of air that presses down on the surface is called the air pressure. Hence, the diagram depicts that air pressure (option D).
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