boiloff

/ˈbɔɪlˌɔf/
noun
  1. The loss of a liquid, especially a cryogenic one, through evaporation or boiling, often unintentionally.
    • Engineers calculated the boiloff rate to determine how much propellant would remain.
    • During the rocket launch, some fuel was lost to boiloff before ignition.
    • The tank is insulated to reduce boiloff of the liquid nitrogen.
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