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The doldrums have low pressure. They have low pressure because the sun's rays hit the doldrums most directly because it is located near/on the equator. Since the sun's rays hit the doldrums, the air is warm. The warm air rises, bringing lowpressure.
Wind is a cousin to the pressure. Pressure moves the wind.
In a low pressure system winds travel in a counterclockwise direction and inward
Vapor materials exert their pressure in just about every direction
The Tropics
positive air pressure then hit a negative air pressure.
Pressure.
Air pressure is exerted in all directions.
Pressure going in the opposite direction in which it should be going.
A low pressure system in the southern hemisphere, rotates in a Clockwise direction.
Peer pressure can be either. When peers are encouraging a peer in a positive direction, it is a blessing. When they pressure a peer in a negative direction it is a menace. Unfortunately, peer pressure is often a menace.
Valves, allown blood through in one direction when the pressure builds up but close when pressure is applied in the opposite direction.