I am trying to produce a table that changes the vertical alignment of the cells for different rows. At the moment I have set up my table so that all the columns are middle and center aligned. However, I would like the last two rows to be vertically aligned at the top as well as being left aligned instead of centered (i.e. \raggedright
instead of \centering
). I was wondering if there was any way of doing this, please.
I am new to TeX so I appreciate my code is probably not very neat! I would appreciate any help, please!
My code is as follows:
\documentclass[12pt,oneside]{report}
\usepackage[utf8]{inputenc}
\usepackage[a4paper,top=2cm,bottom=2cm,left=4cm,right=2cm]{geometry}
\usepackage{graphicx}
\graphicspath{{images/}}
\usepackage{natbib}
\bibliographystyle{agsm}
\usepackage{fixltx2e}
\usepackage{textcomp}
\usepackage[UKenglish]{isodate}
\usepackage{enumitem}
\usepackage[titletoc]{appendix}
\usepackage{longtable}
\usepackage{array}
\usepackage{multirow}
\usepackage{amsmath}
\usepackage{booktabs}
\usepackage[version=3]{mhchem}
\usepackage[labelfont=bf]{caption}
\linespread{1.3}
\begin{center}
\scriptsize
\begin{longtable}[width=1\textwidth]{>{\raggedright}m{3.2cm}>{\centering}m{1.8cm}>{\centering}m{1.8cm}>{\centering}m{1.8cm}>{\centering}m{1.8cm}>{\centering\arraybackslash}m{1.8cm}} \toprule[0.03cm]
\textbf{Property} & \textbf{Methane} & \textbf{Carbon Dioxide} & \textbf{Carbon Monoxide} & \textbf{Hydrogen Sulphide} & \textbf{Hydrogen}\\ \midrule[0.03cm] \endhead
Chemical Symbol & CH\textsubscript{4} & CO\textsubscript{2} & CO & H\textsubscript{2}S & H\textsubscript{2}\\
Molecular Weight & 16 & 44 & 28 & 34 & 2\\
Melting Point (\textdegree C) & -184 & \multirow{2}{*}{\parbox{1.8cm}{\centeringSublimes at -78.5}} & -205 & -85 & -259.14\\
Boiling Point (\textdegree C) & -164 & & -191 & -61 & -252.87\\ \midrule[0.01cm]
Density (kg/m\textsuperscript{3}) & 0.71 & 1.98 & 1.25 & 1.53 & 0.085\\
Solubility in H\textsubscript{2}O at STP (mg/l) & 25 & 1,450 & 21.4 & 4,100 & \parbox{1.8cm}{1.62 at 21\textdegree C}\\
Viscosity (Ns/m\textsuperscript{2}) & 1.03$\times$10\textsuperscript{-5} & 1.4$\times$10\textsuperscript{-5} & 1.66$\times$10\textsuperscript{-5} & 1.0$\times$10\textsuperscript{-5} & 8.7$\times$10\textsuperscript{-6}\\
Diffusion Coefficient in Air (m\textsuperscript{2}/s at STP) & 1.5$\times$10\textsuperscript{-5} & 1.39$\times$10\textsuperscript{-5} & \parbox{1.8cm}{\centering 1.96$\times$10\textsuperscript{-5} at 9\textdegree C} & 1.76$\times$10\textsuperscript{-5} & 6.1$\times$10\textsuperscript{-5}\\ \midrule[0.01cm]
Physical Description and Attributes & Colourless, odourless and flammable gas. Important greenhouse gas. & Colourless, odourless and toxic gas. Important greenhouse gas. & Colourless, toxic, odourless and flammable gas. & Colourless, flammable and toxic gas. Rotten eggs odour at low concentration $<$ 1 ppm. Odourless at concentration $>$ 50 ppm due to anaesthesia of olfactory sense. & Colourless, odourless and flammable gas.\\ \midrule[0.01cm]
Formation & Anaerobic degradation of organic material. & Aerobic and anaerobic degradation of organic materials, action of acid water in carbonate rocks and respiration of soil bacteria. & \ce{SO4^2-}-reducing bacteria obtain energy by oxidising organic matter or H\textsubscript{2} with sulphates and produce H\textsubscript{2}S. Happens in low-O\textsubscript{2} environments (e.g. standing water). Other anaerobic bacteria produce H\textsubscript{2}S by digesting amino acids containing \ce{SO4^2-}. & Incomplete combustion of organic materials. In landfill waste can also be produced by the reduction of CO\textsubscript{2} by nascent H\textsubscript{2}. & Chemical reaction between water and finely divide metal (e.g. Al) in the ground.\\ \bottomrule[0.03cm]
\caption{Chemical and Physical Properties of Hazardous Ground Gases}
\label{tab:chemicalandphysicalproperties}
\end{longtable}
\end{center}