Comment on Banana for scale

BitUnWise@programming.dev ⁨1⁩ ⁨day⁩ ago

• AnUnusualRelic@lemmy.world ⁨43⁩ ⁨minutes⁩ ago

  That’s a bakers mole.

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• sumsinj@lemmy.world ⁨1⁩ ⁨day⁩ ago

  You know that water being exactly 1kg and 1l is specific to one pressure and temperature combination?

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  • BitUnWise@programming.dev ⁨1⁩ ⁨day⁩ ago

    Mole is a number of particles, not a volume. A mole of hydrogen-1 will always have the same mass regardless of temperature or pressure

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    • Eheran@lemmy.world ⁨17⁩ ⁨hours⁩ ago

      The point is that you do not have that precision. But it absolutely is good enough for pretty much everything. A 0.8 % error is often well below measurement error. Like in any mass balance in a chemical system, say a refinery or whatever. You can ignore argon and all other gases except N2 and O2 in air for the same reason in almost every application.

      But even if we apply the same logic, 1.008 is “incorrec” too, it is 1.00794.

      And that is incorrect too, not because of higher precision, but because of binding energy. Two separate hydrogen atoms (2 H) have slightly more mass than one hydrogen molecule (H₂) because forming the H–H chemical bond releases energy, reducing the system’s mass according via

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      • BitUnWise@programming.dev ⁨11⁩ ⁨hours⁩ ago

        This post was about definitions in the metric system, so while 1 mole of hydrogen being 1 gram is pretty close, it isn’t and isn’t defined to be

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    • BreadOven@lemmy.world ⁨14⁩ ⁨hours⁩ ago

      6.022x10^23 particles if I remember correctly.

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      • nightlily@leminal.space ⁨1⁩ ⁨hour⁩ ago

        Avogardo‘s number (Not Avocado‘s number as I wrote in my high school chemistry exam)

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