The loss of liquid through evaporation due to boiling, or the venting of pressurized vapor from a container to prevent overpressurization.
Compound of 'boil' and 'off' (from Old English 'of'), creating a particle verb meaning to remove by boiling. Used in technical contexts, especially in aerospace and cryogenics.
Boiloff is a nightmare for rocket scientists—when storing liquid hydrogen or liquid nitrogen at incredibly cold temperatures, the boiloff rate (how fast it evaporates away) can determine whether a launch window is viable or if you lose your expensive fuel.
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