Why it is recommended to add acid in water during dilution of acid?

When water is added to a concentrated acid during dilution, it causes an exothermic reaction in which a lot of energy is released in the form of heat. The large amount of heat that is released in the reaction changes some water to steam. The explosive manner in which this happens causes the acid to splash over the surrounding area, increasing the risk of acid burns if it touches the skin or clothes. When acid is added to water during dilution, the amount of water is greater than the amount of acid being added, resulting in a dilute solution that doesn’t release excessive amounts of heat. During the process of adding acid to water, the water absorbs the heat and warms up only a little, minimizing the risk of explosive heating or splashing over.