Pascal or Pa is the SI unit for Pressure.
1Pa = 1 N/sq.m, 1 KPa = 1000 Pa, 1 MPa = 1,000,000 Pa
1 bar = 100,000 Pa, 1 millibar (mbar) = 100 Pa
1 atm = 101,325 Pa, 1 mmHg = 133.322 Pa
That means, 1 bar = 1 atm and 1 mbar = 1 mmHg
*SI is the International System of Units
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