Taking the first steps of what would be a major historical advance in the science of measurement, the U.S. National Institute of Standards and Technology is participating in a worldwide effort to ...

How much is a kilogram? 1,000 grams. 2.20462 pounds. Or 0.0685 slugs based on the old Imperial gravitational system. But where does this amount actually come from and how can everyone be sure they are ...

This system, contenting 7 base units, should be used in all country's all over this world (I don't know what's with other planets and dimensions ;-) ), but as we all know : IT IS NOT! It is also ...

NPL has developed the first method for remotely measuring free-field sound pressure with direct traceability to fundamental SI base units for acoustic frequencies up to 20 kHz Scientists at the ...

SI Unit: Every measurement we make, be it for length, time, temperature, or electric current, needs a standard unit so that results are understood universally. To maintain uniformity worldwide, ...

Philosophical Transactions: Mathematical, Physical and Engineering Sciences, Vol. 369, No. 1953, The new SI based on fundamental constants (28 October 2011), pp. 3936-3953 (18 pages) Since 1889, the ...

A new definition of the kilogram is required, an international team of scientists contends. The current one is imprecise, they say, because it is not linked to an unvarying property of nature. The ...

Scientists have developed an optical method for remotely measuring sound pressure inside a fully anechoic chamber which is the first to provide direct traceability to the SI base units. Scientists at ...