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(Under standard conditions), the density of natural gas is 0.7192 Kg/Nm3; therefore, the mass of 1 m3 of natural gas is 0.7192 kilograms. The density of liquefied natural gas is approximately 450 kg/m3, so the mass of 1 m3 of LNG is around 430–470 Kg. One ton equals 2.12 cubic meters, meaning that 1 m3 of LNG is roughly equivalent to 625 cubic meters of natural gas； The price of one ton of liquefied natural gas = 2.12 multiplied by 625 multiplied by 2.05 = 2,716.25 yuan (cost price). Liquefying LNG also requires cryogenic technology, so additional costs must be taken into account! The density of liquefied petroleum gas is 580 kg/m³ in its liquid state, while its density in gaseous form is 2–2.8 kg/m³. One ton of liquefied petroleum gas in liquid form occupies a volume of 1.72 cubic meters. The main components of liquefied petroleum gas are propane and butane. One ton of LPG is equivalent to 1000/2.8 = 358 cubic meters. 1 kilocalorie equals 1000 calories, and 1 calorie equals 4.182 joules. The weight of LNG is only about 45% of that of water with the same volume. LNG has a high ignition point, at 650°C. In case of a fire involving LNG, it is recommended to use dry powder fire extinguishers. CNG cylinders of the same volume can hold only 30% as much gas as LNG cylinders; moreover, the weight of LNG cylinders is one-thirteenth of that of CNG cylinders. This results in lower overall weight for LNG-powered buses with the same passenger capacity, which contributes to energy savings and reduced emissions. Under the same conditions, the range of LNG buses is more than twice that of CNG buses, and the fuel refueling efficiency has also seen a significant improvement