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The constants on which the SI units rely have been assigned fixed numerical values by definition. This is so that you can now build a certain type of experiment
by gmueckl 7y ago
The constants on which the SI units rely have been assigned fixed numerical values by definition. This is so that you can now build a certain type of experiment and calibrate it so that it measures this defined numerical value for that constant. And in doing the calibration, you actually produce a reference for an SI unit.