In the United States and Australia, LPG is made up of liquid propane, but this is not true in all countries. LPG stands for liquefied petroleum gas. In some places, a mixture of butane and propane or other hydrocarbons are labeled LPG as well.
Even in countries where LPG is propane, it can be dangerous to use it interchangeably with other forms of propane. LPG vaporizes readily at temperatures above -44 degrees Fahrenheit and is often used for storage of propane vapor. However, using liquid propane directly in machinery that requires the flow of propane vapor is dangerous and can cause damage to the machine or fires.