LaTeX Forum

\documentclass[ngerman]{scrartcl}
\usepackage[T1]{fontenc}
\usepackage{selinput}
\SelectInputMappings{%
  adieresis={ä},
  germandbls={ß},
  Euro={€}
}
\usepackage{babel}
\usepackage{siunitx}

\sisetup{
  locale=DE
}

\begin{document}
  \begin{table}[!ht]
    \sisetup{table-number-alignment=left,table-unit-alignment=left}
    \begin{tabular}{S@{\,}sS@{\,}s}
       6,8 & \decibel &   72 & \decibel \\
      0,30 & \volt    & 78,7 & \decibel \\
    \end{tabular}
  \end{table}
\end{document}

\documentclass[12pt]{scrartcl}
\usepackage[decimalsymbol=comma]{siunitx}

\begin{document}
\begin{table}
	\begin{tabular}{SS}
		6,8\decibel	& 72\decibel	\\
	 0,30\volt	& 78,7\decibel	\\
	\end{tabular}
\end{table}
\end{document}

\documentclass[12pt]{scrartcl}
\usepackage{amsmath,amssymb,amsfonts,amsthm}
\begin{document}
$$
\begin{matrix}
5&.67&kg\\
45&.2&kg\\
2&.20&kg
\end{matrix}
\end{document}
$$

\documentclass[11pt]{scrartcl}
\usepackage{amsmath,amssymb,amsfonts,amsthm}
\begin{document}
\begin{align*}
5&.67 &&kg\\
45&.2 &&kg
\end{align*}
\end{document}

\documentclass[11pt]{scrartcl}
\usepackage{amsmath,amssymb,amsfonts,amsthm}
\begin{document}
\begin{tabular}{rl}
4.56 & kg\\
23.4 & kg
\end{tabular}
\end{document}