... weight:44.05Physical and Chemical Indicators: Characters:colorless,flammable,volatile,mobile liquid, with pungent irritating odor. Melting point:-123.5°C ... Boiling point:20.16°C Relative density:0.7780 ... Refractive index:1.3311 Flash point:-38°C Solubility:miscible with water, ethanol, ether, benzene ...