The physical properties of methane are :-
(i) Methane is a colorless, odorless, and tasteless nonpoisonous gas.
(ii) Methane is sparingly soluble in water but dissolves readily in alcohol and ether.
(iii) Methane is lighter than air.
(iv) Methane melts at -184°C and boils atomic -161.4°C.
(v) Methane like carbon dioxide, also traps infrared radiations (heat radiations) reflected by the earth. As a result, methane gas also contributes to the greenhouse effect. Actually, a molecule of methane traps twenty times more heat radiations than a carbon dioxide molecule.