Math & Science ⇒ align multiple multi-lined equations

[pkladisios]

I have four consecutive equations and wish their equal signs and their numbering to be aligned. So far, i have only achieved the second by individually using equation and split environments. Here's the minimal code:

Code: Select all

Code, edit and compile here:

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\documentclass[twocolumn]{article}
\usepackage{amsmath} %math 
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{document}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%RT20
\begin{center}
\underline{\textbf{RT20}}
\end{center}
\begin{equation}
\begin{split}
C_{peff}&=444.4711352-170.5210626T\\
&+25.80658991T^{2}-1.912462169T^{3}\\
&+0.06910480624T^{4}-0.0009667426392T^{5}\\
&\text{for } 15^{o}C<T<19.5^{o}C
\end{split}
\end{equation}
\begin{equation}
\begin{split}
C_{peff}&=5529.086311-565.4394794T\\
&+14.50378915T^{2}\\
&\text{for } 19.5^{o}C<T<20.5^{o}C
\end{split}
\end{equation}
\begin{equation}
\begin{split}
C_{peff}&=3780.001949-342.8478233T\\
&+7.797040983T^{2}\\
&\text{for } 20.5^{o}C<T<22^{o}C
\end{split}
\end{equation}
\begin{equation}
\begin{split}
C_{peff}&=3735.906512-536.9879458T\\
&+28.98735267T^{2}-0.6959772441T^{3}\\
&+0.006270432248T^{4}\\
&\text{for } 22^{o}C<T<26^{o}C
 
 
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[Johannes_B]

Every equation is independant from the others. What you are looking for is the align environment.

Code: Select all

Code, edit and compile here:

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\documentclass[twocolumn]{article}
\usepackage{mathtools} %JB: Some improvements over amsmath
\usepackage{siunitx}
\begin{document}
\begin{center}
    \underline{\textbf{RT20}}
\end{center}
\begin{align}
    \begin{split}
        C_{p\mathrm{eff}}&=444.4711352-170.5210626T\\
        &+25.80658991T^{2}-1.912462169T^{3}\\
        &+0.06910480624T^{4}-0.0009667426392T^{5}\\
        &\text{for } \SI{15}{\celsius}<T<\SI{19.5}{\celsius}
    \end{split}\\
    \begin{split}
        C_{p\mathrm{eff}}&=5529.086311-565.4394794T\\
        &+14.50378915T^{2}\\
        &\text{for } \SI{19.5}{\celsius}<T<\SI{20.5}{\celsius}
    \end{split}\\
    \begin{split}
        C_{p\mathrm{eff}}&=3780.001949-342.8478233T\\
        &+7.797040983T^{2}\\
        &\text{for } \SI{20.5}{\celsius}<T<\SI{22}{\celsius}
    \end{split}\\
    \begin{split}
        C_{p\mathrm{eff}}&=3735.906512-536.9879458T\\
        &+28.98735267T^{2}-0.6959772441T^{3}\\
        &+0.006270432248T^{4}\\
        &\text{for } \SI{22}{\celsius}<T<\SI{26}{\celsius}
    \end{split}
\end{align}
\end{document}
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

Run LaTeX here