amount of substance area atmospheric pressure automobile barye blood pressure brownian motion casimir effect cobra probe combined gas law conversion of units cosmological constant dynamic pressure dyne entropy force density gas gradient ideal gas ideal gas law inch kelvin kiel probe kilogram-force mach number microphone mole newton normal force partial pressure peer pressure pitot tube pound-force poundal pounds per square inch real gas rule of thumb scuba diving shear sound pressure square metre stagnation pressure standard atmosphere surface normal technical atmosphere temperature tensor thermodynamics thumbtack timeline of temperature and pressure measurement technology tire ton torr united states customary units units conversion by factor-label vacuum vacuum energy vacuum pump vapor pressure vector area volume water