The 26th General Conference on Weights & Measures (GCWM), which is comprised of 60 member countries, voted for the redefinition of Kilogram. It will be adopted on May 20, 2019 which is World Metrology Day.
Planck’s Constant Planck’s constant is a number that describes the size of the energy packets (or ‘quanta’) that are contained within light. These packets of energy are called photons. Planck’s constant is given the symbol h in physics and numerically is equal to 6.63 x 10^-34 Joule seconds. The equation that defines Planck’s constant is called the Planck-Einstein relation and represented as “E = hf”, where E is the energy of each packet (or ‘quanta’) of light, measured in Joules; f is the frequency of light, measured in hertz; and h is Planck’s constant. |