Methane is a colorless, odorless gas, slightly soluble in water, soluble in alcohol, ether. , density (standard condition) 0.717g/l, boiling point -161.5℃, melting point -182.48℃. Critical temperature (℃) : -82.6, critical pressure (MPa) : 4.59. Flash point (℃) : -188, ignition temperature (℃) : 538.

Methane can be liquefied at temperatures below -161.5 degrees Celsius at atmospheric pressure, or at -82.6 degrees Celsius at an increase of 4.59Mpa.