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<p>is a good example. In this law, one state variable (e.g., pressure, volume, temperature, or the amount of substance in a gaseous equilibrium system) is a function of other state variables so is regarded as a state function. A state function could also describe the number of a certain type of atoms or molecules in a gaseous, liquid, or solid form in a <a href="page.php?w=Heterogeneous_mixture">heterogeneous</a> or <a href="page.php?w=homogeneous_mixture">homogeneous mixture</a>, or the amount of energy required to create such a system or change</p><p>
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