Cooking gas, also known as Liquefied Petroleum Gas (LPG), is a mixture of primarily:

* Propane (C3H8)

* Butane (C4H10)

The exact proportions of propane and butane can vary depending on the source and climate. For example, in colder climates, a higher percentage of propane is used as it has a lower boiling point and remains a gas at lower temperatures.

While the main components are propane and butane, cooking gas can also contain small amounts of other hydrocarbons, such as ethane and pentane, as well as additives like odorants (mercaptans) to make leaks easily detectable.