What substance do LPG containers typically hold?

Liquefied petroleum gas (LPG) is the correct answer because it specifically refers to a mixture of propane and butane, which are commonly used as fuel sources in various applications, including heating, cooking, and powering vehicles. LPG is stored under pressure in its liquid form within containers, and when the pressure is released, it vaporizes into gas. This characteristic makes LPG a significant choice for users requiring efficient and portable energy.

The other substances listed do not accurately represent what LPG containers hold. Compressed natural gas is primarily composed of methane and is stored and utilized under very different conditions. Flammable liquids refer to substances that can ignite easily at room temperature but are not what LPG containers typically contain, as LPG in its stored form is a liquefied gas. Carbon monoxide is a colorless, odorless gas produced by incomplete combustion and is not stored in LPG containers, nor is it a fuel itself used in the same way as LPG. Understanding what LPG is helps reinforce safe practices in handling and storing these containers correctly.