Experimental differences between these states.
Gases exert pressure through the collisions of molecules with the wall of the container.
Typically, P ATM is sufficient to support a column of Hg 760 mm high at sea level. T. Called absolute zero. For example, we know that if we measure the pressure, Temperature, Volume and amount of two gas samples of a particular gas, and find all these properties to be the same, then the gases are in the same state. Equations of state describe the relationship between intensive variables. There are three intensive variables.