Computing Exact Uncertainties—Physical Constants in the Current and in the New SI
IntroductionIn the so-called "new SI," the updated version of the International System of Units that will define the seven base units (second, meter, kilogram, ampere, kelvin, mole and candela) and that goes into effect May 20 of 2019, all SI units will be definitionally based on exact values of fundamental constants of physics. And as a result, all the named units of the SI (newton, volt, ohm, pascal, etc.) will ultimately be expressible through fundamental constants. (Finally, fundamental physics will be literally ruling our daily life 😁.)
Here is how things will change from the evening of Monday, May 20, to the morning of Tuesday, May 21, of this year.