ABYC Systems Certification Practice Exam

LPG, or Liquefied Petroleum Gas, is primarily composed of flammable hydrocarbon gases, primarily propane and butane. These gases are derived from natural gas processing or petroleum refining. When under pressure, they can be easily condensed into a liquid form, making them convenient for storage and transport, while they vaporize back to gas at atmospheric pressure.

This composition of hydrocarbon gases is crucial as it determines LPG's combustion characteristics, energy content, and safety measures required when handling it. Understanding what LPG is made of is especially important in contexts such as boating, cooking, heating, and other applications where precise knowledge of fuel behavior is necessary for safe and effective usage.

Other options like liquid nitrogen and liquid oxygen are entirely different substances with distinct characteristics and applications, and pure butane, while a component of LPG, does not encompass the entire gas mixture that defines LPG.