LaTeX: various width parameters of LaTeX, plus \hsize primitive

width-params.tex

\documentclass[a4paper,twocolumn]{article}
\begin{document}

\begin{itemize}
\item Lorem ipsum dolor sit amet, consectetur adipisicing elit,
sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
\item \verb|\paperwidth| = \the\paperwidth.
\item \verb|\textwidth| = \the\textwidth.
\item \verb|\columnwidth| = \the\columnwidth.
\item \rule[.5ex]{\columnwidth}{.8pt}
\item \verb|\linewidth| = \the\linewidth.
\item \rule[.5ex]{\linewidth}{.8pt}
\item \verb|\hsize| = \the\hsize.
\item \rule[.5ex]{\hsize}{.8pt}
\item Ut enim ad minim veniam, quis nostrud exercitation ullamco
laboris nisi ut aliquip ex ea commodo consequat.
\end{itemize}

\end{document}