Heat baths

0th law of thermodynamics to define temperature, heat conduction, first law (conservation of energy, ΔU = Q – W), second law of thermodynamics (heat bath diagrams to illustrate heat engines and refrigerator).

Edit and compile if you like:

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% Author: Izaak Neutelings (February 2019)
\documentclass[border=3pt,tikz]{standalone}
\usepackage{amssymb,amsmath,physics}
\usepackage{tikz}
\usetikzlibrary{calc,patterns,decorations.pathmorphing}
\tikzset{>=latex}
\colorlet{mydarkblue}{blue!50!black}
\colorlet{myblue}{blue!30}
\colorlet{mydarkred}{red!60!black}
\colorlet{myred}{red!30}
\colorlet{mydarkgreen}{green!60!black}
\colorlet{mygreen}{green!30}
\colorlet{mydarkorange}{yellow!40!red}
\colorlet{myorange}{yellow!80!red}
\colorlet{myyellow}{yellow!80}
\colorlet{mygrey}{black!15}
\colorlet{mydarkgrey}{black!50}
\tikzstyle{bath}=[draw=blue!40!black,top color=blue!10,
                                  bottom color=blue!20,shading angle=30,thick,rounded corners=1]
\tikzstyle{source}=[draw=red!50!black,top color=red!20,
                                   bottom color=red!30,shading angle=30,thick,rounded corners=1]
\tikzstyle{conductor}=[draw=black!40,top color=black!8,
                                  bottom color=black!20,shading angle=30,thick,rounded corners=1]
\tikzstyle{insulator}=[draw=yellow!40!red!80,top color=yellow!90!red!80,
                                          bottom color=yellow!80!red!80,shading angle=10,thick,rounded corners=1]
\tikzstyle{C1}=[draw=black!80!red!70,top color=black!40!red!10,
                                  bottom color=black!80!red!20,shading angle=30,thick]
\tikzstyle{C2}=[draw=black!90!green!70,top color=black!50!green!8,
                                    bottom color=black!90!green!20,shading angle=30,thick]
\tikzstyle{C3}=[draw=black!80!yellow!80,top color=black!20!yellow!10,
                                     bottom color=black!80!yellow!20,shading angle=30,thick]
\begin{document}
% 0th LAW
\begin{tikzpicture}
  \def\dl{0.027}
  \draw[bath]
 
 
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