The Kilogram to be Redefined After 130 Years as Part of Metric System Overhaul21.05.2019
From now on, the kilogram will be defined by fundamental physical and atomic properties, rather than a material, man-made object. The redefinition, unanimously approved at the 26th General Conference on Weights and Measures last November, came into force on May 20.
Representatives from International Bureau of Weights and Measures (BIPM) member states have unanimously approved the plan to redefine basic SI units. The comprehensive overhaul, the BIPM explains, will change the definitions of four SI units—the ampere, mole, kelvin, and kilogram. From 1889 until now, the latter was defined by a one-kilogram cylinder made from a platinum-iridium alloy, kept in an underground vault located in Sèvres, a suburb of Paris.
Le Grand K, as the cylinder was commonly known, ceased to function as the standard kilogram, on May 20. “The redefinition of the SI draws on fundamental physical constants, universal for the entire universe. When the overhaul is complete, the basic units of measure and those derived from them will be based on the pillars of our world—physical constants. Science and technology will no longer be constrained by mutable material artifacts,” writes the Polish Bureau of Weights and Measures.
Nową definicję kilograma stworzono z wykorzystaniem tzw. stałej Plancka – jednej z podstawowych stałych, często pojawiającej się w równaniach mechaniki kwantowej. Ma ona wartość 6,626070150 × 10^-34 kg·m2/s i wiąże kilogram z prędkością światła oraz podstawową jednostką czasu, czyli sekundą. Oznacza to, że definicja kilograma, choć odnosi się teraz do zupełnie innego systemu miar, jest teraz dużo bardziej precyzyjna.
The new kilogram will be based on the Planck constant, one of the most fundamental constants in quantum mechanics. The value of the constant is set to 6,626070150 × 10^-34 kg·m2/s, thus binding the kilogram to the meter and the second. This means that although dependent on other units, the definition of the kilogram much more precise now.
The Central Office of Measures was quick to add that the redefinition will have basically no impact on our everyday lives. The numbers on our kitchen scales will not change—the redefinition will, however, be important to scientists worldwide as it will make the data underpinning their research efforts that much more precise.
see also
- Felix Umarov | The art of directing Papaya Films Original Series
People
Felix Umarov | The art of directing
- Insect Diet. EU Food Safety Agency Approves Manufacture of Food with Yellow Mealworm
News
Insect Diet. EU Food Safety Agency Approves Manufacture of Food with Yellow Mealworm
- Announcing the winners of the 2nd Papaya.Rocks Film Festival Papaya Rocks Film Festival
News
Announcing the winners of the 2nd Papaya.Rocks Film Festival
- A Fortune for a Comic Book. First Edition of The Incredible Hulk #1 from 1962 Sold for Nearly $500K
News
A Fortune for a Comic Book. First Edition of The Incredible Hulk #1 from 1962 Sold for Nearly $500K
discover playlists
-
PYD: Music Stories
07
PYD: Music Stories
-
Domowe koncerty Global Citizen One World: Together at Home
13
Domowe koncerty Global Citizen One World: Together at Home
-
Branded Stories PYD 2020
03
Branded Stories PYD 2020
-
Music Stories PYD 2020
02
Music Stories PYD 2020