In the exploitation, transportation and sales of natural gas, thousands of cubic meters or cubic meters are used by volume. When chemical and petrochemical natural gas is used as raw material, the composition of natural gas will change, so it is often calculated by converting the calorific value of natural gas.

Natural gas is measured in thousands of cubic meters internationally and in China, but it is sold in cubic meters in China, and canned gas for civil use is sold to consumers in kilograms. Basically these three units. Among them, it is very inaccurate to measure natural gas in kilograms.