Is it hot or gas?

Does the subject want to ask "natural gas is expensive or gas is expensive"? Natural gas.

1, the ingredients are expensive. The main chemical composition of natural gas is methane, which is formed by geological movement and chemical action, and it is a one-time non-renewable resource. Natural gas is a waste of petrochemical industry, which is formed by distillation, stratification and liquefaction of crude oil, and is a fuel gas formed by reprocessing.

2. High calorific value. The calorific value of natural gas per cubic meter is 2.54 times that of artificial gas. It is natural that natural gas is more expensive than gas.