Glycerin has an average molecular mass of 92.09. It boils at about 290°C while it melts at about 20°C. Glycerin has a specific gravity of 1.26 (20/20°C) and a vapor density of 3.17 (AIR=1). The nonelectrolyte solvent is soluble in water, ethanol, acetone, and DMSO while insoluble in ether and benzene. Glycerin has a surface tension of 64.8 g/s2 (20°C) and a refractive index of 1.4758 (20°C). This odorless alcohol is combustible, with a flash point of 199°C and an autoignition value of 370°C.
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