|An example of two states of human existence, in terms of an initial state (day one) and final state (day 360x) of Gibbs free energy, for a typical pair of reactive single humans (human molecules) in their early 20s. |
f(P, V, T) = 0
"The laws of motion and the state of a physical system at a given moment in time unambiguously and uniquely determine the state of the system at all other moments of time, both in the future and in the past."
“U is the mechanical energy of a body in a given state.”
|Visualization of the concept of "state", by two positions of a pendulum, whereby a body, in an initial state 0, held under the initial constraint of the force X0 of the pendulum arm, is brought to a new state 1 through the application of a displacing force X1, which drives the system (or body) to a new equilibrium state, which is determined by both the contraints X0 and X1.  |
A single point on the PV plane, representative of two of the three variables of a f(P,V,T)=0 state equation, defines the state of the system. 
“Man is the result of a purposeless and materialistic process that did not have him in mind. He was not planned. He is a state of matter, a form of life, a sort of animal, and a species of the order primates, akin nearly or remotely to all of life and indeed to all that is material.”— George Simpson (1967), The Meaning of Evolution