From 5cacf4ffaf3a9621ab536195f6469f98a420f054 Mon Sep 17 00:00:00 2001 From: Prefetch Date: Sat, 5 Sep 2026 21:55:33 +0200 Subject: Improve knowledge base --- source/know/concept/maxwell-relations/index.md | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-) (limited to 'source/know/concept/maxwell-relations/index.md') diff --git a/source/know/concept/maxwell-relations/index.md b/source/know/concept/maxwell-relations/index.md index 892ced1..f51acea 100644 --- a/source/know/concept/maxwell-relations/index.md +++ b/source/know/concept/maxwell-relations/index.md @@ -9,7 +9,7 @@ layout: "concept" --- The **Maxwell relations** are a useful set of relations in thermodynamics. -They arise from the fact that the order of differentiation is irrelevant +They arise from the fact that the ordering of differentiation is irrelevant for well-behaved functions (sometimes known as the *Schwarz theorem*), applied to the [thermodynamic potentials](/know/concept/thermodynamic-potential/). @@ -54,7 +54,7 @@ $$\begin{aligned} = \Big( \pdv{B}{x} \Big)_y^{-1} \end{aligned}$$ -The following quantities are useful to rewrite some of the Maxwell relations: +The following quantities can be useful to rewrite some of the Maxwell relations: the iso-$$P$$ thermal expansion coefficient $$\alpha$$, the iso-$$T$$ combressibility $$\kappa_T$$, the iso-$$S$$ combressibility $$\kappa_S$$, @@ -73,6 +73,10 @@ $$\begin{gathered} C_P \equiv T \Big( \pdv{S}{T} \Big)_{P,N} \end{gathered}$$ +But for simplicity and brevity, +we will not do any such rewriting in this article. + + ## Internal energy @@ -116,6 +120,7 @@ $$\begin{gathered} \end{gathered}$$ + ## Enthalpy The following Maxwell relations can be derived @@ -158,6 +163,7 @@ $$\begin{gathered} \end{gathered}$$ + ## Helmholtz free energy The following Maxwell relations can be derived @@ -200,6 +206,7 @@ $$\begin{gathered} \end{gathered}$$ + ## Gibbs free energy The following Maxwell relations can be derived @@ -242,10 +249,11 @@ $$\begin{gathered} \end{gathered}$$ + ## Landau potential The following Maxwell relations can be derived -from the Gibbs free energy $$\Omega(T, V, \mu)$$: +from the Landau potential $$\Omega(T, V, \mu)$$: $$\begin{gathered} - \mpdv{\Omega}{V}{T} = -- cgit v1.3