11/ The meter finally left artifact based definitions behind in the 1960's when timing equipment was precise enough that the meter could be defined as the distance light travels in a vacuum in 1/299,792,458 of a second.
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20/ The BIMP is expected to recommend this new definition be adopted this month, ending a journey begun more than a century ago. The SI unit system will finally be a truly universal system, free of any human artifacts. And that to me is a profoundly beautiful thing.
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Oops. I accidentally reffered to the Bureau International des Poids et Mesures as "BIMP" when the correct abreviation is "BIPM". I also mistook the decade when the speed of light definition of the meter was adopted. It was the 1980s, not the 1960s.
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Max Fagin you have outdone yourself good sir.
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Thank you Emily! That means a great deal coming from you!
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All units would now therefore be subject to variance as earths magnetic field changes, rotation slows etc etc
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They would IF the second was still defined as 1/86400 of Earth's daily rotation. Fortunately, it isn't anymore. No matter what happens here on Earth, the units will remain unaffected (at least, once the IPK is retired).
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What is the SI unit a kg and not a g?
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Same reason Americans use US Customary units. Mostly tradition.pic.twitter.com/mmcuzE91Dg
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Why can't you use 'the mass of an electron' or somethimg? Or the mass of X number of H20 atoms at Y kelvin?
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That actually was tried with the Avogadro Project (though the material used was Silicon atoms). The concept is theoretically sound, but in practice, it isn't possible yet to determine how many atoms are present in a macroscopic sample to the required parts-per-billion precision.
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Hi, you can read this thread from
@MaxFagin here:https://threader.app/thread/1058062583511404545 …
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Great thread. Questions if I may? 1. What’s the % diff between the new theory to define a KG & the IPK? 2. Will this impact every day life? For example, will somebody pay more/ less for a kilo of fruit? In other words, will organisations that use Kilo redefine their calc’s?
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Like other units, they are just changing from an artifact definition to a universal constant. So actual measurements aren't changing.
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I get that - using a kilo a bad example. Let say an org that uses a pound weight measurement. This is derived by calculation from the Kilo. The new kilo changes by 0.3% say - the calc for a pound is the same but the result must differ by 0.3% due to the base factor change? Thanks
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It won't change. The percentages mentioned above are from the little tricks he mentions to get an estimate. Any calculable difference from the change would be negligible.
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For your own sanity, I recommend never looking at how the energy industry measures units and conversion factors. I spent years researching this and it is a mindfuck. Theoretically, fuels *should* be measured with calorific values, but a LOT of the time someone just guesses.
Thanks. Twitter will use this to make your timeline better. UndoUndo
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Bonjour please find the unroll here: Thread by
@MaxFagin: "November is here, and that means a massive shift is coming. And by "massive" I am of course referring to the redefinitio […]" https://threadreaderapp.com/thread/1058062583511404545.html … Enjoy :)
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Excellent thread, but I'm disappointed it's not BIMP
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It's hard out here for a BIMP
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