Waves in a gas

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% Author: Izaak Neutelings (December 2020)
% http://hyperphysics.phy-astr.gsu.edu/hbase/Waves/standw.html
\documentclass[border=3pt,tikz]{standalone}
\usepackage{amsmath}
\usepackage{etoolbox} % ifthen
\usepackage{tikz}
\usetikzlibrary{arrows.meta} % for arrow size
\tikzset{>=latex} % for LaTeX arrow head
\colorlet{myred}{red!65!black}
\colorlet{xcol}{blue!70!black}
\colorlet{vcol}{green!60!black}
\colorlet{Pcol}{orange!80!black}
\colorlet{dense air}{Pcol!70!red!60}
\colorlet{thin air}{brown!10}
\tikzstyle{vvec}=[->,vcol,very thick,line cap=round]
\tikzstyle{force}=[->,myred,thick,line cap=round]
\tikzstyle{wood}=[very thick,brown!70!black]
\tikzstyle{piston}=[blue!50!black,top color=blue!30,bottom color=blue!50,middle color=blue!20,shading angle=0]
\tikzstyle{walldark}=[blue!20!black,top color=black!10!white!90!blue,bottom color=black!20!white!90!blue,shading angle=-30]
\tikzstyle{wall}=[blue!20!black,top color=black!5!white!90!blue,bottom color=black!10!white!85!blue,shading angle=30]
\def\tick#1#2{\draw[thick] (#1) ++ (#2:0.1) --++ (#2-180:0.2)}
\tikzstyle{myarr}=[xcol!50,-{Latex[length=3,width=2]}]
\begin{document}
%% AIR PARTICLE DENSITY - test
%\begin{tikzpicture}
%  \def\lam{2.0} % wavelength
%  \def\N{1000}
%  \fill[left color=white,right color=white,middle color=blue!80!black!30]
%    (0,0) rectangle (\lam/2,1);
%  \fill[left color=white,right color=white,middle color=blue!80!black!30]
%    (\lam/2,0) rectangle (\lam,1);
%  \draw (0,0) rectangle++ (\lam,1);
%  \foreach \i in {1,...,\N}{
%    \fill[blue!40!black] ({acos(-rand)*\lam/360},{(1+rand)/2}) circle(0.008);
%    \fill[blue!40!black] ({\lam/2+acos(-rand)*\lam/360},{(1+rand)/2}) circle(0.008);
%  }
%\end{tikzpicture}
 
 
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Click to download: waves_air.tex • waves_air.pdf
Open in Overleaf: waves_air.tex