81. Which of the terms best describes the process of the production of vapor above the surface of a boiling cargo due to evaporation on an LNG tanker?

Boil-off describes the evaporation of liquefied gas cargo, such as LNG, due to heat ingress. This process generates vapor above the liquid surface, a standard occurrence on LNG tankers. Adiabatic processes involve no heat transfer, solidification is a liquid-to-solid phase change, and condensation is the opposite of evaporation.