Is 1 bar the same as 1 atmosphere?

Nearly, but not exactly. 1 bar = 0.9869 atm. The difference is about 1.3%.

At what depth underwater does pressure reach 2 atm in bar?

2 atm ≈ 2.0265 bar, reached at approximately 10 meters of water depth.

Atmospheres to Bar Converter

Convert atmospheres to bar for chemistry, process engineering, and comparing pressure standards. The atmosphere and the bar are nearly equal, making this one of the simplest pressure conversions.

Formula

Multiply atmospheres by 1.01325 to get bar. To reverse, divide bar by 1.01325 to get atmospheres.

Quick reference

Atmosphere (atm)	Bar (bar)
0.5	0.506625
1	1.01325
1.5	1.519875
2	2.0265
3	3.03975
5	5.06625
10	10.1325
20	20.265
50	50.6625
100	101.325

About these units

Atmosphere

The standard atmosphere (101,325 Pa) was formally defined in 1954 as the reference pressure for thermodynamic tables. It corresponds to the average atmospheric pressure at sea level and 0°C.

Bar

The bar (100,000 Pa) was introduced in meteorology by Vilhelm Bjerknes in 1909. Its near-identity with one atmosphere made it a practical unit for pressure gauges and gas systems in European engineering.

← All Pressure conversions