Fortune Telling Collection - Zodiac Analysis - Q is a state function?
Q is a state function?
Q is not a state function, and the sum of W and Q is equal to the internal energy change of the initial state and the final state (it might as well be written as δ E). On the premise that the state remains unchanged from beginning to end, we can make W more and Q less, or Q more and W less, depending on the evolution of the system. But no matter what the process is, W+Q is always the same, that is, δ E. So neither W nor Q is a state function (called a process function), but E is a state function. Under certain conditions, the nature of the system no longer changes with time, and its state is certain. A series of physical quantities representing the state of a system are called state functions. Sometimes it is also called thermodynamic potential, but "thermodynamic potential" refers to four thermodynamic functions with energy dimensions, such as internal energy, enthalpy, Gibbs free energy and Helmholtz free energy.
The state function characterizes and determines the macroscopic properties of the system state. The state function has a definite value only for the equilibrium system, but not for the non-equilibrium system. When solving various thermodynamic functions, it is usually necessary to do path integration. If the integration result has nothing to do with the path, the function is called a state function, otherwise it is called a non-state function.
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