1

I want to add equation in which there is an explanation of what means the symbols used in the equation. So far, I have this

enter image description here

And I want to have somethihg like this:

enter image description here

Can anyone help me, please?

My MWE is:

\documentclass{book}
\usepackage[utf8]{inputenc}
\begin{document}
\begin{equation}
Umsatz = V_{R} \times R_{Zeit} \times R_{Konz} \times \dot{c}
\end{equation}

With

\begin{table}[h!]
\begin{tabular}{cc}
Umsatz & total mass flow converted during the reaction in {kmol/h} \\
$V_{R}$ & Catalyst volume in $m^{3}$
\end{tabular}
\end{table}
\end{document}

Thank you in advance.

  • Off topic : never use table wan you do't need a float ! tabular or tabularx, or the alignments structures of amsmath/mathtools (as shown below) will do the job. – Jhor Aug 22 '18 at 20:27
3

A possible solution with alignat andfleqn from nccmath: which places equation environments at the left margin (with a cusstomisable distance from the left margin). I took the liberty to replace ‘with’ by ‘where’, which is better style. Also units are not typed in italic; to have a correct formatting of units, use the siunitx package:

\documentclass{book}
\usepackage[utf8]{inputenc} 
\usepackage[T1]{fontenc} 
\usepackage{array}
\usepackage{mathtools, nccmath}
\usepackage{siunitx} 

\begin{document}

\begin{fleqn}
   \begin{alignat}{2}
     & \text{Kinetic } & \quad & \mathit{Umsatz} = V_{R} \cdot R_\text{Zeit} \cdot R_\text{Konz} \cdot \dot{c} \\[1.5ex]
     & \text{where} & &
    \begin{tabular}[t]{@{}r <{:}@{\space}l}
    $ \mathit{Umsatz} $ & total mass flow converted during the reaction in \si{kmol/h} \\
    $V_{R}$ & Catalyst volume in \si{m^{3}}
    \end{tabular} \notag
    \end{alignat}
\end{fleqn}

\end{document} 

enter image description here

  • :\,\space seems like overkill and also the extra space in \text{Kinetic }. On another note, despite that _\text{...} works, I thought we should encourage users to write _{\text{...}}. ;-) Also, why not use \cdot instead of \times as shown in the picture from the OP? – Ruixi Zhang Aug 22 '18 at 20:24
  • 1
    You're right, I removed \,. As to \times I guess I was looking at the other picture. 'Tis fixed. Thank you for pointing these inconsistencies! – Bernard Aug 22 '18 at 20:31
  • Thanks! It worked! iIs there any way to add a line break without adding to the second line the ":" at the beginning? – user151562 Aug 23 '18 at 7:26
  • I'm not too sure exactly what you're referring to. Do you mean you'd like to have ‘Umsatz:’ with a colon and ‘$V_R$’ without? – Bernard Aug 23 '18 at 7:48

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