Photochemistry

Rarity: Rare

A topic known well beyond its field, found in many languages.

Rarity follows how well known the article is: its views on the French and English Wikipedia over a year, and the number of languages it exists in.

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What Wikipedia says

Photochemistry is the branch of chemistry concerned with the chemical effects of light. Generally, this term is used to describe a chemical reaction caused by absorption of ultraviolet (wavelength from 100 to 400 nm), visible (400–750 nm), or infrared radiation (750–2500 nm).

Excerpt from the Wikipedia article “Photochemistry”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Masohe, CC BY-SA 4.0, via Wikimedia Commons.