At ambient temperature and atmospheric pressure Methyl Chloride is a colorless inflammable gas heavier than air and with a very weak sweetish odor. In water it is only sparingly soluble but well in organic solvents. It can be liquefied by cooling below -24 °C or by pressurizing to approx. 5 bar at 20 °C, to give a clear, colorless fluid that will vaporize fast under room conditions generating much coldness. Methyl Chloride forms a solid, snow-like hydrate with water of composition CH₃Cl.6H₂O, which may preferably develop if liquefied Methyl Chloride containing water is vaporized by expansion cooling. This hydrate will decompose above 5 °C.