At room temperature and atmospheric pressure, propylene is a colorless, flammable, and non-toxic gas. At 20 ℃ and O The relative density of gas at 1MPa (air=1) is 1.48. Boiling point -47.7 ℃. Triple point -185.2 ℃. Gas density 1.7855kg/m3 (20 ℃, 0.1MPa). At 20 ℃ and saturation pressure, the liquid density is 513 9kg/m3. The critical temperature is 91.8 ℃, the critical pressure is 4600kPa, and the critical density is 233kg/m3. The latent heat of melting is 71.354kj/kg. Gas specific heat capacity at 15.6 ℃ and 0.1 MPa: Cp62. 345J／(mol.K), Cv54. 035J／(mol.K) Cp/CVl.154。 At 49.8 ℃ and saturation pressure, the specific heat capacity of the liquid is 91 555J/(mol – K) at 25 ℃ and 0 Gas thermal conductivity at 1MPa is 0.01778W/(m.K)- The thermal conductivity of liquid at 40 ℃ is 0.13703W/(m.K). Solubility in water is 22.05cm3/100mL water (20 ℃, 0.1MPa). The flammability limit in air is 2.0% to 11.1% by volume, and the self ignition temperature is 460 ° C. Transported as liquefied compressed gas at 21.1 ℃ and its own vapor pressure of 942kPa.