Assuming you're talking about atmospheric pressure, it is caused by the earth's gravity and varies from place to place due to the forces of different forms of weather.
Air pressure is all around you. Atmospheric pressure is the weight of earth's atmosphere. So the pressure is going to be related to gravity or to centrifugal force in one way or another.
It is different in that the seas don't have air pressure. No air; no air pressure.
Air pressure affects air movement because air moves from high pressure to low pressure. The air pressure pushes or will press the air around.
air
The moon has no air pressure because the moon has no air.
As air pressure pressure decreases with altitude, so does the densite of air.
air pressure is the amount of air pushing down on you and high pressure is air that rises.
Cold air increases air pressure
Air pressure is the force exerted by the weight of air in the atmosphere. Differences in air pressure cause air particles to move from areas of high pressure to areas of low pressure, in an attempt to equalize the pressure. This movement of air particles creates wind.
Cold air is denser than warm air, so it exerts a higher pressure. When cold air moves into an area, it can increase the air pressure in that location. Conversely, when warm air moves into an area, it can decrease the air pressure.
It affects the air pressure because the more higher level you have the more air pressure and the lower you have the lower the air pressure will be.
high pressure to low pressure
Air pressure is caused by the weight of the air above pushing down on the air below. As altitude increases, there is less air above, resulting in lower air pressure. Temperature and humidity can also affect air pressure.