Properties of substances like pressure, temperature and density, in thermodynamic coordinates are

path function

point function

cyclic function

real function

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Point Function: They depend on the state only, and not on how a system reaches that state. They are also known as state functions. All properties of a substance are point functions. For example- pressure, temperature and density.

In contrast,

Path function: Their magnitudes depend on the path followed during a process as well as the end states. For example- work done in moving from one point to the other.

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