METHANE. Methane is a colorless, odorless gas with a wide distribution in nature. It is the principal component of natural gas, a mixture containing about 75% CH. At room temperature, methane is a gas less dense than air.It melts at 183Â°C and boils at 164Â°C. It is not very soluble in water.t is the principal component of natural gas, a mixture containing about 75% CH. At room temperature, methane is a gas less dense than air. It melts at 183Â°C and boils at 164Â°C. It is not very soluble in water.