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Cake day: August 16th, 2023

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  • Natanael@slrpnk.nettoMicroblog Memes@lemmy.worldThe speed of light
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    9 minutes ago

    For somebody who claims to be acutely aware, you really seem to have no idea what goes into calibrating measurement devices to be able to measure physical constants. In particular you have no idea how many other units go into calibrating them, and how you fundamentally can not get an accurate reading of a physical constant without that calibration. And for somebody claiming I’m the condescending one, you’re awfully rude yourself

    Just see the definition of the kilogram, and how it’s now defined in relation to time, c, and the planck constant.

    While the second is the only base unit to be explicitly defined in terms of the caesium standard, the majority of SI units have definitions that mention either the second, or other units defined using the second. Consequently, every base unit except the mole and every named derived unit except the coulomb, gray, sievert, radian, and steradian have values that are implicitly at least partially defined by the properties of the caesium-133 hyperfine transition radiation. And of these, all but the mole, the coulomb, and the dimensionless radian and steradian are implicitly defined by the general properties of electromagnetic radiation.

    https://en.wikipedia.org/wiki/Caesium_standard

    Everything meaningful is defined as relative properties, as ratios to other forces and properties of nature.




  • Natanael@slrpnk.nettoMicroblog Memes@lemmy.worldThe speed of light
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    12 hours ago

    It’s not useful to tell somebody it is constant without a way to make use of it. Without knowing how it’s defined relative to other things we can’t use it.

    The thing about all the absolute physical constants is that they are almost all based on units defined relative to other things. Unitless constants (defined only as a ratio) are extremely rare (like the fine structure constant) - but even then you have to make up units to measure them (although you can still agree on unitless values with somebody else who chose different base units for measurements).

    https://en.wikipedia.org/wiki/Dimensionless_physical_constant