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. Note that, if we know 2 of these variables, then we know the third, by using this equation. Equations of state are useful because they reduce the number of variables that we need to know to describe a system. For any single component system with one phase, only 2 intensive variables are required to describe the state at equilibrium. Yes, the state of each is completely described and is the same.