Question

Holaa
What canea atmospheric pressure. What is its value.
Vame the improved form of sample barometer and the barometer which no liquid
ets used. *​

Answer 1

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Pressure is the force per area imparted by the bouncing molecules. If you had a perfect vacuum on one side of a wall, the force on it from the atmosphere would be 14.7 pounds per square inch, or 101,325 Newtons/square meter in SI units.

The pressure goes down as altitude goes up because there is a shorter column of air above you pushing down by gravity. The formula is rho*g*h where rho is the density, g is gravitational acceleration, and h is the column height above you (which goes to zero as you rise out of the atmosphere into outer space). There are lots of places on the web that give you pressure versus altitude but it does change a little all the time. The sun warms the air and the density changes, or the night time thermal radiation to space cools the air and density changes. Those density changes change the pressure a little, and is the cause of wind.