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State function
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==History== It is likely that the term "functions of state" was used in a loose sense during the 1850s and 1860s by those such as [[Rudolf Clausius]], [[William John Macquorn Rankine|William Rankine]], [[Peter Tait (physicist)|Peter Tait]], and [[William Thomson, 1st Baron Kelvin|William Thomson]]. By the 1870s, the term had acquired a use of its own. In his 1873 paper "Graphical Methods in the Thermodynamics of Fluids", [[Willard Gibbs]] states: "The quantities ''v'', ''p'', ''t'', ''Ξ΅'', and ''Ξ·'' are determined when the state of the body is given, and it may be permitted to call them ''functions of the state of the body''."<ref>{{harvnb|Gibbs|1873|pages=309–342}}</ref>
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