\begin{equation}\label{eq:gas-composition-set-total-composition-weight-cpp} W_{total} = \sum_{i} W_{i} \qquad \end{equation}

\begin{equation}\label{eq:gas-composition-weight-fraction} f_{i} = \frac{W_{i}}{W_{total}}\end{equation}

\(W_{total}\)	Total composition weight \([\unit{ \pound}]\)
\(W_{i}\)	Weight of constituent i \([\unit{ \pound}]\)
\(f_{i}\)	Weight fraction of constituent i \([\unit{ \unitless}]\)