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How many units of air pressure?

1 bar = 100 kPa = 10 Newton/cm2 = 0. 1 MPa.

It is the unit of atmospheric pressure, which used to be commonly used in meteorology, but now it is changed to the equivalent international unit of hectopascals.

1 Pascal is the abbreviation of 1 Pascal, which means that one square meter bears a pressure of one Newton.

The unit of kilogram force is still used in engineering, 1 kilogram force is equal to 9.80665 Newton, from which it is concluded that:

1 kgf/cm2 = 0.9674 1 atmospheric pressure =98066.5 Pascal = 1 atmospheric pressure.

Millimeter mercury is also a commonly used unit of pressure, and the pressure generated by 1 millimeter mercury is defined as torr.

1 Torr = 1 mmhg = 133.32 Pascal.

1 atm =760 torr