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Cake day: November 19th, 2023

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  • Hule@lemmy.worldtoScience Memes@mander.xyz1.2 Å
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    3 days ago

    … However, they soon realized that the definition of the metre at the time, based on a material artifact, was not accurate enough for their work. So, around 1907 they defined their own unit of length, which they called “Ångström”, based on the wavelength of a specific spectral line. It was only in 1960, when the metre was redefined in the same way, that the angstrom became again equal to 10^10 metre. Wikipedia

    Edit: also some atoms are about 1 angstrom in size, so it’s convenient, I guess…