New posts in Metrology

Why are scientists involved in the Avogadro Project using silicon-28 atoms instead of carbon-12?

Proper reference for the International System of Units

Is the fact that 100 kPa equals about 1 atmosphere accidental?

Why are electrical units (specifically, electrical current) considered a base unit?

Why is the meter considered a basic SI unit if its definition depends on the second?

Why is the mol a fundamental physical quantity?

If the candela is a base SI unit, why isn't the sone an SI unit at all?

Is there any truth to interpreting definition of a second as corresponding to oscillations?

Why is a second equal to the duration of exactly 9,192,631,770 periods of radiations?

Why isn't a meter defined from a kilogram of water?