Surface pressure is the atmospheric pressure at a location on Earth's surface terrain and oceans .It is directly proportional to the mass of air over that location For numerical reasons, atmospheric models such as general circulation models GCMs usually predict the nondimensional logarithm of surface pressure The average value of surface pressure on Earth is 985 hPa..Air pressure is the weight of air molecules pressing down on the Earth. The pressure of the air molecules changes as you move upward from sea level into the atmosphere. The highest pressure is at sea level where the density of the air molecules is the greatest. Measuring air pressure .Air pressure. the force exerted by air, whether compressed or unconfined, on any surface in contact with it. Compare atmospheric pressure..Air Pressure. A good example of this is adding or subtracting air in an automobile tire. By adding air, the number of molecules increase as well a the total number of the collisions with the tire's inner boundary. The increased number of collisions forces the tire's pressure increase to expand in size..Atmospheric pressure, also called barometric pressure, force per unit area exerted by an atmospheric column that is, the entire body of air above the specified area . Atmospheric pressure can be measured with a mercury barometer hence the commonly used synonym barometric pressure , which indicates the height of a column of mercury that exactly balances the weight of the column of .Air Pressure. That's because molecules collide with each other and things like your arm, the ground, or a tree. They exert a force on those surfaces. Air has pressure too. Air molecules constantly bounce off each other and everything else around them. The force exerted by these air molecules is called air pressure..
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