Liquefied petroleum gas (LPG) is primarily composed of alkanes such as propane and butane. As a gaseous gas, LPG is heavier than air and, when released into the atmosphere, will settle in low-lying areas and can be carried by the wind. It is highly flammable and explosive.
At 20 degrees Celsius, the pressure of LPG is 0.8 MPa, and at 40 degrees Celsius, the pressure can reach 1.59 MPa. If the volume of LPG remains constant, the pressure increases by 0.04 MPa for every 1 degree Celsius increase in temperature. The maximum pressure that an LPG tank can withstand is 2.1 MPa.
The explosive limits of LPG in air are 1.5%-9.5%. LPG exhibits thermal expansion and contraction properties, with an extremely high coefficient of thermal expansion, approximately 10 to 16 times that of water.