No. 17,775 in Russian
ультрафиолета
"Ultraviolet" (a type of electromagnetic radiation).
In a sentence
Использование ультрафиолета помогает дезинфицировать воду.
The use of ultraviolet helps disinfect water.
Here, "ультрафиолета" is in the genitive case, which is required by the construction "использование ... помогает" (use of ... helps).
Кварцевые лампы производят свет ультрафиолета для стерилизации.
Quartz lamps emit ultraviolet light for sterilization.
In this sentence, "ультрафиолета" is in the genitive case, following "свет", which means "light".
Этот материал способен поглощать небольшое количество ультрафиолета.
This material is capable of absorbing a small amount of ultraviolet.
Here, "ультрафиолета" is in the genitive case after "количество", meaning "amount".
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