measurement unit

This Friday will determine the existence of the kilogram unit
For over 100 years, Paris has been the home of Le Grand K - a metal block that defines the exact weight of a kilogram.
'Secrets' of the standard mass of US stored in a vacuum glass cage
The standard US kilogram block is K20, which is extremely well preserved and is vacuum-glazed.
A physicist proposes a uniform measurement system in space
A physicist has proposed to overcome the lack of reasonable consistency in the measurement system of astronomical and astrophysics.
Official: 1 kilogram is no longer 1 kilogram, and so are 3 other basic quantities
Since the World Science Measurement Day 20/5/2019, the definition of a new kilogram will be officially applied.