![]() In the atmosphere, air pressure can be exerted in all directions. Since molecules move in all directions, they can even exert air pressure upwards as they smash into object from underneath. Heated molecules move with increased velocity, striking the container's boundary with greater force, which is observed as an increase in pressure. Adding heat to a container can transfer energy to air molecules. The second way of changing air pressure is by the addition or subtraction of heat. The increased number of collisions increases the pressure and forces the tire to expand in size. ![]() By adding air, the number of molecules increases, as does the total number of the collisions with the tire's inner boundary. This is observed as an increase in pressure.Ī good example of this is adding or subtracting air in an automobile tire. First, simply adding molecules to a container will increase the pressure because a larger number of molecules will increase the number of collisions with the container's boundary. However, when we sum the total forces from the large number of molecules that strike a surface each moment, then the total observed pressure can be considerable.Īir pressure can be increased or decreased in one of two ways. Despite their tiny size, when they strike a surface, they exert a force on that surface in what we observe as pressure.Įach molecule is too small to feel and only exerts a tiny bit of force. ![]() The atoms and molecules that make up the various layers of the atmosphere are constantly moving in random directions.
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