Pressure & Pascal’s Principle

Some basic diagrams to explain pressure, pressure variation over depth, Torricelli’s law and Pascal’s principle.
For more related figures, please have a look at the Fluid Dynamics category.

Pressure on a surface:

Pascal’s principle (or Pascal’s law):

Forces on a container with a fluid:

Weight of a column fluid:

Pressure variation over depth:

Torricelli’s law:

Pascal’s principle in to understand a hydraulic press:

Edit and compile if you like:

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% Author: Izaak Neutelings (November 2020)
\documentclass[border=3pt,tikz]{standalone}
\usepackage{siunitx}
\usepackage{physics}
\usepackage{tikz}
\usepackage[outline]{contour} % glow around text
\usetikzlibrary{patterns,decorations.pathmorphing}
\usetikzlibrary{arrows.meta}
\tikzset{>=latex}
\contourlength{1.1pt}
\colorlet{mydarkblue}{blue!50!black}
\colorlet{myred}{red!65!black}
\colorlet{vcol}{green!45!black}
\colorlet{watercol}{blue!80!cyan!10!white}
\colorlet{darkwatercol}{blue!80!cyan!20!white}
\colorlet{metalcol}{blue!40!black!10!white}
\tikzstyle{force}=[->,myred,very thick,line cap=round]
\tikzstyle{vvec}=[->,very thick,vcol,line cap=round]
\tikzstyle{piston}=[blue!50!black,top color=blue!30,bottom color=blue!50,middle color=blue!20,shading angle=0]
\tikzstyle{water}=[draw=mydarkblue,top color=watercol!90,bottom color=watercol!90!black,shading angle=5]
\tikzstyle{vertical water}=[water,
  top color=watercol!90!black!90,bottom color=watercol!90!black!90,middle color=watercol!80,shading angle=90]
\tikzstyle{dark water}=[draw=mydarkblue,top color=darkwatercol,bottom color=darkwatercol!80!black,shading angle=5]
\tikzstyle{metal}=[draw=metalcol!20!black,top color=metalcol,bottom color=metalcol!90!black,shading angle=10]
\tikzstyle{width}=[{Latex[length=3,width=3]}-{Latex[length=3,width=3]}]
\def\tick#1#2{\draw[thick] (#1)++(#2:0.1) --++ (#2-180:0.2)}
\begin{document}
% PRESSURE
\begin{tikzpicture}[x={(1cm,0)},y={(0.65cm,0.6cm)},z={(0,1cm)}]
  \def\L{1.6} % cube side
  \def\P{0.7} % pressure size
  \draw[dark water] (0,0,0) -- (\L,0,0) -- (\L,\L,0) -- ( 0,\L,0) -- cycle;
  \draw[force] (0.5*\L,0.5*\L,1.01*\P) node[right=2,above=3] {$P$} --++ (0,0,-\P);
  \foreach \x/\y in {0.5/0.5,0.5/0.2,0.2/0.5,0.5/0.8,0.8/0.5,0.8/0.8,0.2/0.8,0.2/0.2,0.8/0.2}{
    \draw[force] (\x*\L,\y*\L,1.01*\P) --++ (0,0,-\P);
  }
\end{tikzpicture}
 
 
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