Question

What is the relation between bar and atm?

Answer 1

1 Atm = 1.01325 Bars

Atmospheric pressure is the force per unit area by the weight of air above that point. 1 atmosphere is about 101.325 kilopascals. Barometer is a device used to measure the atmospheric pressure.

Bar is the atmospheric pressure at the sea level, which is around 100 kilopascals. 

1 Bar = 0.986923267 Atm

Bar is the atmospheric pressure at the sea level, which is around 100 kilopascals. Since the difference between these units is so small, in most applications bar unit is used.

Atmospheric pressure is the force per unit area by the weight of air above that point. 1 atmosphere is about 101.325 kilopascals.