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    juul (juul@mastodon.xyz)'s status on Tuesday, 23-May-2023 18:28:24 JSTjuuljuul
    in reply to
    • James Dreben :mw:

    @Jdreben Yes though this might lead someone to think that we can see the entire spectrum where water is transparent. Water is transparent in a wider spectrum than humans can see and there are fish that can see infrared and shrimp that can see pretty far into the UV spectrum (mantis shrimp). There is a good reason why animals don't see into the deep UV tough: It's blocked by the ozone layer. https://en.wikipedia.org/wiki/Electromagnetic_absorption_by_water#/media/File:Absorption_spectrum_of_liquid_water.png

    In conversationTuesday, 23-May-2023 18:28:24 JST from mastodon.xyzpermalink

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      Electromagnetic absorption by water
      The absorption of electromagnetic radiation by water depends on the state of the water. The absorption in the gas phase occurs in three regions of the spectrum. Rotational transitions are responsible for absorption in the microwave and far-infrared, vibrational transitions in the mid-infrared and near-infrared. Vibrational bands have rotational fine structure. Electronic transitions occur in the vacuum ultraviolet regions. Liquid water has no rotational spectrum but does absorb in the microwave region. Its weak absorption in the visible spectrum results in the pale blue color of water. Overview The water molecule, in the gaseous state, has three types of transition that can give rise to absorption of electromagnetic radiation: Rotational transitions, in which the molecule gains a quantum of rotational energy. Atmospheric water vapour at ambient temperature and pressure gives rise to absorption in the far-infrared region of the spectrum, from about 200 cm−1 (50 μm) to longer wavelengths towards the microwave region. Vibrational transitions in which a...
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