The International System of Units
is called "SI"
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WHAT IS A METER?
of the KILOGRAM as a CONSTANT MATHEMATICAL
For more than a century the world's fundamental unit of mass has been based on a single, cylindrical piece of metal. And authorized copies of it stored in secured chambers around the world including the United States, over the years in infinitesimal ways, are shedding or accumulating atoms here and there, thus throwing off the accuracy of the objects meant to be the world standard for measurements of mass.
The 4 cm tall ingot of platinum and iridium, known as the International Prototype Kilogram, offered the world a standardized way of measuring what earlier scientists defined as 1 kilogram being the mass of 1 liter of distilled water (at sea level).
But to ensure greater accuracy there is a method of nano-measurement using "Watt Balance" housed at the U.S. National Institute for Standards and Technology (NIST) near Washington, DC, which is a bid to recast the kilogram as a mathematical equation, unerring, immutable and ultimately easy for experts to reproduce.
And it is expected to yield groundbreaking calculations.
The ultimate purpose of the "Watt Balance" is to help scientists generate a reliable calculation of Planck's Constant. A universal value that quantifies the relationship between energy, light and an object's mass, which in turn will produce a new,
more accurate basis for defining the kilogram worldwide.
The race to reinvent the unit of measurement was considered important, partly because the kilogram is the only holdout in the metric system still based on a physical object rather than a formula derived from a universal constant.
The meter, once pegged to the length of a bar of platinum, was redefined in 1983 by a formula using the speed of light as the distance light travels in a vacuum over 1/299,792,458 of a second. Which means that the length of a meter will never change.
kilogram however is redefined as "JUST A BUNDLE OF ENERGY"