From today on the new kilogram measure governs

But last November, the 60 Member States of the General Conference of Weights and Measures voted unanimously to redefine the value of the kilogram according to a small but immutable scale called "Planck constant", which began to govern this May 20

In addition to the units of measurement of weight, the definitions of ampere (electric current), kelvin (thermodynamic temperature) and mol (quantity of a substance) have been modified.

All modern mbad measurements are derived from the kilogram, whether it is micrograms of pharmaceutical drug or gold dust, kilograms of fruit or fish or tons of steel . This update will affect them all.

Scientists have determined that the prototype does not always have the same weight. even within its three glbad bells, it collects microparticles of dirt and is affected by the atmosphere; an update was therefore necessary.

This can have profound implications. If the prototype loses mbad, the atoms would theoretically weigh more, since the basic kilogram should always, by definition, always weigh one kilogram.

Therefore, the scientific community has updated the standards as the counter, which is not 100 centimeters, is actually "the length of the path traveled by light in a vacuum for a period of time of 1 / 299,792,458 second ".

The "Planck constant", derived from quantum physics, can be used in conjunction with a hook scale, an extremely accurate scale, to calculate the mbad of an object using a precisely measured electromagnetic force.

"The redefinition of the SI is a historic moment in scientific progress," said Martin Milton, director of the Weights and Measures Bureau.

"The use of the fundamental constants we observe in nature as the foundation of important concepts such as mbad and time means that we have a stable base from which we can advance our understanding." to develop new technologies and address some of the biggest challenges in society, "he added.

Barry Inglis, who heads the Weights and Measures Committee, said the implications were immense. "Now we will no longer be limited by the limitations of objects in our measure of the world, but we will have universally accessible units that can pave the way for greater precision and even accelerate scientific progress," he said. added.

We could say that the redefinition of the kilo is the most important SI unit since the second was recalculated in 1967, a decision that has helped to facilitate global communication through technologies such as GPS and Internet.