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Isothermal and adiabatic compression of water

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documentclass[a4paper]{article}
usepackage{graphicx,amsmath,amssymb}
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renewcommand{imath}{text{i}}
renewcommand{dfrac}[2]{#1/#2}

begin{document}
title{Compression of water}
date{today}
maketitle
The fundamental law of thermodynamics is
begin{equation}
dE= TdS - P dV
end{equation}
Here $TdS$ is the heat that flows into the water in case of a small quasi static change of the thermodynamic variables, and $P dV$ is ...

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$2.19