Question

Answer in one sentence. What is atmospheric pressure ? ​

Answer 1

Answer:

the pressure exerted by the weight of the atmosphere, which at sea level has a mean value of 101,325 pascals (roughly 14.6959 pounds per square inch).

Answer 2

Atmospheric pressure is the force exerted by an atmospheric column per unit area.

• It is also commonly known as Barometric pressure.
• The atm unit corresponds to the Earth's mean sea-level atmospheric pressure i.e the atmospheric pressure at sea level is approximately 1 atm.
• The gravitational attraction of the earth on the atmospheric gases above the surface causes atmospheric pressure.
• The earth's atmospheric pressure is 101, 325 Pa.
• A mercury barometer can be used to measure atmospheric pressure since it indicates the height of a mercury column that perfectly balances the weight of the atmosphere column above the barometer.
• Because atmospheric pressure fluctuates with altitude on Earth, air pressure on mountains is lower than air pressure at sea level.
• From the Earth's surface to the top of the mesosphere, pressure varies gradually.
• The air pressure is also affected by temperature and humidity.
• Temperature is proportional to pressure, whereas humidity is inversely proportional.