Methane gas is the fuel of the general public known as, in fact, currently in Taiwan for gas fuel system for home use of liquefied petroleum gas and natural gas is divided into two categories.

Liquefied petroleum gas LPG

LPG system from the refining of crude oil or natural gas processing propane and butane are precipitated by mixing at room temperature and atmospheric pressure gas can be liquefied by compression or cooling is usually pressurized cylinders mounted for users, it is also known as liquefied gas or bottled gas.

Liquefied petroleum gas is colorless, odorless, non-toxic, flammable, explosive, based on security considerations, the use of liquefied petroleum gas supply household odor agent are added, there is a leak can be detected.

LPG pressurized liquid is filled into the cylinder, but out of the container will become a gas, liquid volume after volume of gasification compared amplified 270 times; heat value of about 10720 kcal per kg. After the weight of LPG gasification is about five times that of air, so when the leak, or easy to remain in the lower corner. Air mixed with 1.8 to 9.5% of the liquefied petroleum gas, encountered the fire source will produce a fire or explosion.