The vapours created due to the ambient heat input (while maintaining constant pressure in the storage vessel) are called “boil-off”. The discharge of these vapours out of the storage container is called venting. The boil-off is inherent to the storage of a cryogenic due to the heat input from ambient.

What is boil off in chemistry?

vb. (Chemistry) to remove or be removed (from) by boiling: to boil off impurities. n. liquified gases removed from a substance through evaporation.

What is the boil off rate?

marine. The amount of liquid that is evaporating from a cargo due to heat leakage and expressed in % of total liquid volume per unit time.