Chemical ingredients — such as avobenzone, oxybenzone and homosalate — absorb the UV rays. Both types of sunscreen can degrade or wash off over time, so it’s important to reapply every two hours, and more frequently if you’re swimming or sweating. 2023 July 15, Dana G. Smith, “Why Sunscreen Is the Only Anti-Aging Product You Need”, in The New York Times:
UV en · NOUN
Meanings
(abbreviation, alt-of, countable, uncountable) Abbreviation of ultraviolet.
(attributive, countable, uncountable) The axes of a two-dimensional texture, as opposed to those (X, Y, Z) of the three-dimensional model to which it is applied.