Liquefied gas or liquefied petroleum gas (LPG) is a popular energy source used in households and industries globally. It's a hydrocarbon-based fuel that's liquefied through compression, mostly composed of propane and butane. LPG is an inexpensive and clean-burning fuel option, which makes it popular for cooking, heating, and powering certain vehicles. LPG has some synonyms, namely propane, butane, liquid petroleum gas, and bottled gas. These terms are often used interchangeably, and all refer to the gas in its liquid form. LPG has been used safely and cost-effectively for decades, and it continues to be a reliable fuel source for many homeowners and businesses.