External state variable

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An external state variable of a thermodynamic system is a state variable that only depends on the generalized coordinates of external bodies with which the system interacts .

External state variables are z. B. the strength of the gravitational field when there is a gas in the earth's field .

See also

Internal quantity of state

literature

Boris M. Jaworski, Andrej A. Detlaf: Physics at hand: Definitions - Laws - Theories; Page 147f. Springer-Verlag, 2013, ISBN 9783322850447 .