The three other basic SI units — the second, the metre and the candela — are already based on constants. For example, since 1983, the metre has been defined according to the speed of light: ...

The metric system, also known as the International System of Units (SI), is the most comprehensive and precise system for measuring the universe that humans have developed. In 2018, the 26th General ...

The method has also been controversial because it will break the link that the kilogram has to other base SI units, particularly the mole, which measures the amount of a substance in terms of the ...

There are seven base SI units. While second (time), meter (length) and candela (unit of luminous intensity) have long been based on 'constants of nature' (quantum standards), the redefined units ...

In the past few decades, scientific development has reached the phase that has allowed humankind to leave artifacts representing the kilogram and the metre behind, and define them based on natural ...

The century-old artifact that defines the kilogram, the fundamental unit of mass, is to be replaced by a more accurate standard based on an invariant property of nature ...

At a meeting in Versailles on November 16th, the world’s measurement bodies are almost certain to approve a resolution that will mean four out of the seven base SI units, including the kilogram ...

Single-electron flow measured in bid to overhaul SI base unit. You have full access to this article via your institution. Physicists have tracked electrons crossing a semiconductor chip one at a ...