blog_latex_tables.tex

\usepackage{siunitx, float, booktabs, caption}

\begin{document}
  \maketitle
  \begin{multicols*}{2}

    \begin{table}[H]
      \captionsetup{singlelinecheck = false}
      \begin{tabular*}{0.5\textwidth}{@{\extracolsep{\fill}} @{}lll@{}}
        \toprule
        Key         & Initial               & Final\\
        \midrule
        Mass        & \SI{14.47}{\kilogram} & -\\
        Voltage     & \SI{7.40}{\volt}      & -\\
        Current     & \SI{2.12}{\ampere}    & -\\
        Temperature & \SI{18}{\celsius}     & \SI{22}{\celsius}\\
        \bottomrule
      \end{tabular*}
      \caption{Some data for blog post}
    \end{table}

  \end{multicols*}
\end{document}