Here are two solutions, with vertical lines, and without, more ‘professional’ (requires the booktabs
package). In both cases, I use the makecell
package, that allows for a common formatting and line breaks is column and row heads, and cellspace
for some vertical padding.
\documentclass[a4paper]{article}
\usepackage[utf8]{inputenc}
\usepackage{amsmath}
\usepackage{array, booktabs, multirow, makecell, cellspace} %
\setlength\cellspacetoplimit{3pt}
\setlength\cellspacebottomlimit{5pt}
\renewcommand\theadfont{\bfseries}
\usepackage{eqparbox}
\begin{document}
\begin{table}
\begin{tabular}{ |
>{\centering\arraybackslash} p{5cm}
| >{\centering\begin{eqminipage}[l]{COL}}p{2cm}<{\end{eqminipage}}
| >{\centering\arraybackslash}S{p{2cm}}
| >{\centering\arraybackslash}p{2cm}
| >{\centering\arraybackslash}p{2cm} |} \hline
\thead{Oil Concentration} & \thead{\makebox[0pt]{Colour}} & \thead{Oil} & \thead{Water} & \thead{Rock} \\
\hline
\multirowthead{3}[-1ex]{N-Decane + Oil Red O} & Red & 88 & 109 & 24 \\\cline{2-5}
& Green & 72 & 112 & 14 \\ \cline{2-5}
& Blue & 58 & 105 & 13 \\
\hline
\multirowthead{3}{N-Decane + Oil Red O & & & & \\ $ + {}$ Cyclo Hexane\\ Pentanoic Acid} & Red & 155 & 137 & 15 \\
\cline{2-5}
& Green & 114 & 164 & 11 \\ \cline{2-5}
& Blue & 110 & 125 & 1 \\
\hline
\multirowthead{3}{N-Decane + Oil Red O & & & & \\ $ + {}$ Cyclo Hexane\\ Butyric Acid} & Red & 180 & 179 & 24 \\
\cline{2-5}
& Green & 164 & 209 & 20 \\ \cline{2-5}
& Blue & 143 & 177 & 13 \\
\hline
\multirowthead{3}{N-Decane + Oil Red O & & & & \\ $ + {}$ Cyclo Hexane\\ Carboxylic Acid} & Red & 162 & 136 & 17 \\
\cline{2-5}
& Green & 121 & 119 & 7 \\
\cline{2-5}
& Blue & 95 & 107 & 0 \\
\hline
\end{tabular}
\end{table}
\begin{table}
\begin{tabular}{@{} %
>{\centering\arraybackslash} p{5cm}
>{\centering\begin{eqminipage}[l]{COL}}p{2cm}<{\end{eqminipage}}
>{\centering\arraybackslash}S{p{2cm}}
>{\centering\arraybackslash}p{2cm}
>{\centering\arraybackslash}p{2cm}@{}}
\toprule
\thead{Oil Concentration} & \thead{\makebox[0pt]{Colour}} & \thead{Oil} & \thead{Water} & \thead{Rock} \\
\cmidrule(lr){1-5}
\multirowthead{3}[-1ex]{N-Decane + Oil Red O} & Red & 88 & 109 & 24 \\
& Green & 72 & 112 & 14 \\
& Blue & 58 & 105 & 13 \\
\addlinespace
\multirowthead{3}{N-Decane + Oil Red O & & & & \\ $ + {}$ Cyclo Hexane\\ Pentanoic Acid} & Red & 155 & 137 & 15 \\
& Green & 114 & 164 & 11 \\
& Blue & 110 & 125 & 1 \\
\addlinespace
\multirowthead{3}{N-Decane + Oil Red O & & & & \\ $ + {}$ Cyclo Hexane\\ Butyric Acid} & Red & 180 & 179 & 24 \\
& Green & 164 & 209 & 20 \\
& Blue & 143 & 177 & 13 \\
\addlinespace
\multirowthead{3}{N-Decane + Oil Red O & & & & \\ $ + {}$ Cyclo Hexane\\ Carboxylic Acid} & Red & 162 & 136 & 17 \\
& Green & 121 & 119 & 7 \\
& Blue & 95 & 107 & 0 \\
\bottomrule
\end{tabular}
\end{table}
\end{document}
