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.
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Atmospheric pressure decreases with increasing altitude. This is because there is less air above pushing down on the air below as you move higher in the atmosphere. As a result, atmospheric pressure is highest at sea level and decreases as you move higher in elevation.
As the altitude rises, the air pressure decreases. The pressure decreases because there is less air above you. Imagine an "ocean" of air sitting on top of you all the time. That's what is responsible for the 101.3 kPa of pressure you feel. As you increase your altitude, just like if you were coming up from deep under the water, there will be less weight on top of you pushing down, thus the pressure will decrease.
The higher up you are, the less air pressure. The air thins out the higher you go, thus leaving less air in the atmosphere to push you down.
the higher the elevation the lower the air pressure
this happens because the higher the elevation the less dense the air
If you mean height above the Earth's surface, atmospheric pressure varies inversely with altitude.
The higher one's elevation, the lower the atmospheric pressure. Pressure drops away close to nothing much above 100,000 feet.
atmospheric pressure ... the diff. in the two pressure in which it will find the height from the level of sea
Both the can in the pan of water and the mercury barometer function based on the principle of atmospheric pressure. In both cases, changes in atmospheric pressure will cause a corresponding change in the level of water or mercury in the device. The height of the water or mercury serves as an indicator of the atmospheric pressure at that moment.
Atmospheric pressure decreases with height due to the weight of the air above pushing down on the air below. As you move higher in the atmosphere, the air becomes less dense because there is less weight of air above it, leading to a decrease in pressure.
You must add the atmospheric pressure.
No, the atmospheric pressure changes much too slowly.