what does pa mean in chemistry
The unit of pressure in the SI system is the pascal (Pa), defined as the force of one newton per square meter: [latex]1\text{Pa}=1\text{N}\cdot\text{m}^{-2}[/latex] In chemistry, it is more common to express pressures in units of atmospheres or torr: 1 atm = 101325 Pa = 760 torr [latex]\approx[/latex] 760 mm Hg Torr and millimeters of mercury (mm Hg, defined as a one millimeter difference in the height of a mercury barometer at 0Â°C) are nearly equivalent.