2 atm is used to indicate the pressure at which a chemical reaction is carried out.
Symbol "atm" which stands for standard 'atmosphere'
What is atm unit used for?
The standard 'atmosphere' (abbreviated to atm) is a convenient unit for measuring pressures. 1 atm is equal to 101.325 kPa or 14.7 psi, which corresponds to atmospheric pressure at mean sea level. In reality, atmospheric pressure varies quite widely with elevation, weather, temperature and humidity.
Is atm the same as bar?
Atmosphere originally was a unit related to the air pressure at sea level. It was later defined as 1.01325 x 105 pascals. A bar is a pressure unit defined as 100 kilopascals. This makes one atmosphere nearly equal to one bar, specifically: 1 atm = 1.01325 bar.
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