What units are used to measure gas pressure?

Question

Serenity Allen · Accepted Answer

A torr.

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. )

Owen Ambrose · Answer

Perhaps we should finally address this question....

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 atmosphere"-=760*mm*Hg-=101.3*kPa-=32*"psi"#... 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 pressure"-="internal 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"=1*atm.#

Wyatt Atkins · Answer

undefined The units used to measure gas pressure include atmospheres (atm), millimeters of mercury (mmHg or Torr), pascals (Pa), kilopascals (kPa), pounds per square inch (psi), and bars (bar).