Pressure
Force distributed perpendicularly over an area This article is about pressure in the physical sciences. For other uses, see Pressure (disambiguation). Pressure Common symbols p , P SI unit Pascal [Pa] In SI base units 1 N/m 2 , 1 kg/(m·s 2 ), or 1 J/m 3 Derivations from other quantities p = F / A Dimension M L -1 T -2 Pressure as exerted by particle collisions inside a closed container Thermodynamics The classical Carnot heat engine Branches Classical Statistical Chemical Quantum thermodynamics Equilibrium / Non-equilibrium Laws Zeroth First Second Third Systems State Equation of state Ideal gas Real gas State of matter Equilibrium Control volume Instruments Processes Isobaric Isochoric Isothermal Adiabatic Isentropic Isenthalpic Quasistatic Polytropic Free expansion Reversibility Irreversibility Endoreversibility Cycles Heat engines Heat pumps Therma...