what is atmospheric pressure? what is it caused by?
Answers
Answer:
Atmospheric pressure is the force exerted on the each part of the earth's surface by the column of air above the earth.
Explanation:
This is a simple question on definition.
We simply define what atmospheric pressure is, what causes it and how it's measured.
Atmospheric pressure is the force exerted on the earth's atmosphere on each part of the earth's surface.
Atmospheric pressure is caused by the weight Of air above the earth's surface.
Atmospheric pressure varies with the altitude of the earth's surface.
At high altitudes the pressure is low.
Atmospheric pressure is measured using a barometer.
The units for measuring atmospheric pressure is mmHg.
Atmospheric pressure is the pressure which is exerted by atmosphere of the earth at any point.
EXPLANATION:
Atmospheric pressure can be defined as the amount of “force per unit area” which is exerted against the surface by the air weight above that surface. It is represented by the symbol atm. Its SI unit is Pascal (Pa).
Cause of atmospheric pressure is weight of column of the air which effect as follow:
- Change in density of ambient air also change atmospheric pressure.
- Change in elevation: Increase in elevation from the earth to sky will cause decrease in atmospheric pressure because due to the number of air molecules are lesser, air density or weight decreases.