\relax \@writefile{toc}{\contentsline {section}{\numberline {1}Pascal's Principal}{1}} \@writefile{toc}{\contentsline {section}{\numberline {2}$P=\rho g h$}{2}} \@writefile{toc}{\contentsline {subsection}{\numberline {2.1}Example:}{2}} \@writefile{toc}{\contentsline {subsubsection}{\numberline {2.1.1}What if the bottom of the pipe is closed?}{2}} \@writefile{toc}{\contentsline {section}{\numberline {3}${\begingroup dP\endgroup \over dy}=-\rho g$, where $\rho $ is the density of the fluid.}{2}} \@writefile{toc}{\contentsline {subsection}{\numberline {3.1}Example}{3}}