Now, World gets the new redefined units of measurement of Kilogram, Kelvin, Mole, and Ampere to bring perfection in measurement.
These new International System of Units (SI) were implemented on World Metrology Day which was on 20th May 2019.
India and 100 other nations worldwide have given up artifacts based measure to adopt fundamental physical constants based measures to redefine these units.
A resolution to redefine 4 out of 7 base units was passed by the representatives of 60 countries at the General Conference on Weights and Measures (CGPM) of the International Bureau of Weights and Measures (BIPM), Paris on 16 November 2018, and the resolution was unanimously adopted this year in 2019.
The Council of Scientific & Industrial Research- National Physical Laboratory (CSIR-NPL) has also published a book titled “Redefined SI Units and Glimpses of NPL Metrological Activities” on this occasion.
The new measure for kilogram from 2019 will be derived from constants of nature that are all interdependent. It will be set by the value of Planck constant in combination with definitions of meter and second.
Kibble balance will be used to make accurate measures of Planck constant. Kibble balance is set of scales, which uses force produced by current-carrying wire in a magnetic field to balance the weight of the mass.
It will not have any special impact on the general public, as they may continue to shop in the market as before. Only the weight of kilogram weight will change.
Kilogram is the SI unit of weight.
Kelvin is the SI unit of temperature.
Mole is the SI unit of amount of substance.
Ampere is the SI unit of current.
The other base units are second, metre and candela.