What units are used to measure gas pressure?

2 Answers
May 20, 2018

A torr.

Explanation:

760 Torr equal one atm, or atmospheric pressure. And the piece of equipment used to measure torrs is manometer.

( Sorry this is short if you need further understanding await the answer of someone else. )

May 20, 2018

Perhaps we should finally address this question....

Explanation:

Gas pressure may be quoted with units of foot-pounds, mm Hg, Pascals...all of these report force per unit area. For chemists, probably the most intuitive unit is the atmosphere.

And 1 atmosphere760mmHg101.3kPa32psi...

As a refinement....engineers often speak of gauge pressure versus absolute pressure. When we fill a tyre on a car, and we use the manual in the car to give us the appropriate pressure, the gauge pressure is specified, the which is the pressure OVER atmospheric....i.e.

gauge pressureinternal pressure atmospheric pressure

A tyre at atmospheric pressure would thus have ZERO gauge pressure. Sometimes (especially in the States) we see psig, i.e. pounds per square inch gauge.

Thus ZERO gauge pressure=1atm.