Reaction of calcium oxide with water | CaO + H2O = Ca(OH)2
Calcium oxide is a key component of cement, also called quicklime. Slaked lime - calcium hydroxide - is sometimes called "fluff". It is used in construction and industry.
When quenching, a large amount of heat is released, and part of the water evaporates. The temperature can reach 300°C.
https://chemiday.com/en/reaction/3-1-...