Question

Conclusion for atmospheric pressure.

Answer 1

Answer:

Atmospheric pressure is defined as the pressure exerted by atmospheric air on the

surface area of earth, due to the force of gravitational attraction. Therefore, it is

related to the weight of the air column on the earth’s surface. However, air is a gas

mixture and expands to use the entire volume available, exerting pressure, not only

on the ground, but in all directions.

Normal atmospheric pressure is equal to the pressure exerted by a mercury column

at a sea level of 76 cm, at 0 °C. We call this value atmosphere (atm.) and use it as a

relative unit for pressure. Besides atmospheres, other pressure units are the mercury

millimeters (mmHg), milibars (mbar) and kilopascals (kPa).

So we have: