how much pressure does the earth's atmosphere exert at sea level
This force exerted by air molecules or what is called as Atmospheric pressure is measured by barometer. At sea level the amount of pressure exerted by the atmosphere is about 14.7 pounds/square inch. This means at sea level an object experiences 14.7 pounds of pressure pushing against every square inch of object. When heat energy is added to molecules, they begin to move rapidly. This causes the molecules to exert increased pressure as they bump into the objects around them.