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Air pressure is simply the weight of the air above you. Air pressure falls with height because the higher you go up, the less air there is above you to weigh down on you.
The lower you go into the sea level, the greater the air pressure. The higher you go above the sea level, the lower the air pressure.
The higher you go up the lower the pressure but less air
Think of the air pressure on any horizontal surface as the weight of all the air above it, all the way to the top of the atmosphere. As you increase altitude (go higher, on a mountain or in an airplane), there is steadily less atmosphere above you, and the air pressure steadily decreases with altitude.
Same reason water pressure is higher the deeper you go. There's more stuff above, pressing down. Air has density and weight too.
Air pressure decreases as you go higher.
The air is thinner the higher you go.
The air is thinner the higher you go.
The air pressure decreases the higher you go. This the reason that climbers hoping to reach the top of Mount Everest, carry air cylinders as the air is so thin.
Air pressure starts to go away
Air pressure is simply the weight of the air above you. Air pressure falls with height because the higher you go up, the less air there is above you to weigh down on you.
The lower you go into the sea level, the greater the air pressure. The higher you go above the sea level, the lower the air pressure.
Inversely with altitude, the higher up you go the less air pressure
the air pressure will increase
The higher up you go in elevation the thinner the air around you becomes making it hard to breathe for many people.
It drecrease
Air pressure is caused by the weight of all the air stacked up above you. The higher you go, the less air there is above you, so the pressure is lower.