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Boiling point is the temperature at which a liquid vaporizes.
Unlike melting points, boiling points are not generally used as a gauge of purity, although they are still an important physical property to consider when analyzing a compound.
The boiling point of a liquid depends on the mole fraction (mass or volume) of each chemical in the mixture. A homogenous mixture of two volatile compounds will boil at a temperature between their respective boiling points. A mixture of acetonitrile and water, for example, has a boiling point of 76.1 oC.
Distillation, or separating, a solvent by its boiling point is one of the most common organic chemistry methods. Ideally, the lower boiling material will vaporize first and be collected separately from the higher boiling material. However, sometimes this is not possible, such as in the case of a binary azeotrope like acetonitrile and water.
Vapor-phase DCM, which may be released through various waste streams, is expected to oxidize in the atmosphere by reaction with photochemically produced hydroxyl radicals. The half-life of this reaction in air is estimated to be approximately 119 days.
DCM is also expected to volatilize from dry soil surfaces. The vapor pressure of DCM is estimated to be very high, and its estimated Koc is 24. This indicates that biodegradation of DCM is possible in soil, but it will probably be very slow compared with evaporation.
