Question 1474 Deck General

The correct answer is A) boil-off. The process described is the production of vapor above the surface of a boiling cargo due to evaporation on an LNG (Liquefied Natural Gas) tanker. This is known as the "boil-off" process, where the liquid LNG cargo gradually evaporates and turns into a gaseous state due to the natural heat transfer from the environment. This boil-off gas is typically collected and used as fuel for the LNG tanker's propulsion system. The other options are incorrect because: B) Condensation refers to the process of vapor turning into liquid, which is the opposite of what is happening in this scenario. C) Solidification refers to the process of a liquid turning into a solid, which is not the case for an LNG cargo. D) Adiabatic refers to a process that occurs without the transfer of heat, which is not the primary mechanism at play in the boil-off process.