What type of gas is typically stored in a propane tank?

A propane tank is specifically designed to store liquefied petroleum gas (LPG), which primarily consists of propane and butane. LPG is a mixture of hydrocarbons that are in a gaseous state at normal atmospheric pressures but can be liquefied by applying pressure or reducing the temperature. This property allows for efficient storage and transportation of the gas in a compact form. When the gas is needed, it can be converted back to a gaseous state for use in heating, cooking, or fuel for engines.

The correct answer highlights that propane is an integral component of LPG, which is frequently associated with residential and commercial applications for its accessibility and high energy content.