Question 1128 Deck General

The correct answer is D) rollover. Rollover refers to the spontaneous mixing of a tank's liquid contents when a heavier layer forms above a less dense lower layer. This occurs due to the instability of the density stratification, which can be caused by factors such as temperature or composition changes. The heavier upper layer mixes rapidly with the less dense lower layer, leading to a homogenization of the tank's contents. The other options are incorrect: A) Flash over refers to the sudden ignition of flammable vapors, which is not the same as the spontaneous mixing described in the question. B) Boil off refers to the evaporation of a liquid, which is also different from the mixing process. C) Cascading is not the correct term for the spontaneous mixing of a tank's liquid contents.