Thermodynamic functions

Thermodynamic functions, like resistance, isochores and isotherms.

For more figures related to thermodynamics, see the “thermodynamics” category.

Edit and compile if you like:

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\documentclass[border=3pt,tikz]{standalone}
\usepackage{amsmath,amssymb}
\usepackage{tikz}
\tikzset{>=latex}
\colorlet{myblue}{black!50!blue}
\colorlet{mygreen}{black!50!green}
\colorlet{myred}{black!50!red}
\begin{document}
% RESISTANCE vs. TEMPERATURE
\begin{tikzpicture}
  \def\N{20}
  \def\xmin{-0.1} \def\xmax{1.6}
  \def\ymin{-0.1} \def\ymax{1.6}
  \draw[->,thick]
    (\xmin,0) -- (1.1*\xmax,0) node[right] {$T$};
  \draw[->,thick]
    (0,\ymin) -- (0,1.1*\ymax) node[above=5pt,below left,align=center] {$R$\\ or $\rho$};  
  \draw[thick,myblue,variable=\x,domain=0:\xmax,samples=\N,smooth]
    plot (\x,0.3+\x*\x/2);
\end{tikzpicture}
% PRESSURE vs. TEMPERATURE
\begin{tikzpicture}
  \def\xmin{-2.0} \def\xmax{2.0}
  \def\ymin{-0.1} \def\ymax{1.8}
  \def\tick#1#2{\draw[thick] (#1+.08) --++ (0,-.16) node[below=-.5pt] {#2};}
  \def\ym#1#2{#1*\xmin,{#2*(#1*\xmin-\xmin)/(\xmax-\xmin)}}
  
  % AXIS
  \draw[->,thick]
    (1.1*\xmin,0) -- (1.1*\xmax,0) node[right=2,below] {$T$ [$^\circ$C]};
  \draw[->,thick]
    (0,\ymin) -- (0,1.1*\ymax) node[left,align=center] {$P$};
  
  % TICK
  \tick{\xmin,0}{$-273.15$}
 
 
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