THC has a boiling point of 200°C (392°F). (At 200°C (392°F) THC boils. Clear vapor from a vaporizer.) However before the THC boils, other parts of the oil evaporate and boil. At 21°C (70°F) the most volatile terpenoids start to evaporate, lending a pungent odor to the air. At 31°C (87°F) the less volatile terpenoids start to evaporate, lending the air even more pungent odors. At 39°C (102°F ) virtually all of the terpenoids undergo evaporation fairly rapidly. At 50°C (122°F) THC-Acid decarboxylates as the water molecule held in the carbonate form evaporates. This activates the THC. At 66°C (150°F) Cannabidiol (CBD) melts and starts to evaporate. At 185°C (365°F) Cannibinol (CBN) boils.
