Question

What is one atmosphere of pressure?

Answer 1

One atm. is the same (per definition) as 101325 pa. This approximately the same as `10^5` pa which is 1 bar.

Explanation:

The standard atmosphere is defined as 101325 pa. As you can see, this is pretty close to `10^5` pa which is equal to 1 bar.

Keep in mind that pressure is defined as the force exerted on a certain area. Therefore the SI unit of pressure `pa` is the same as `N*m^(-2)`.