Redefining the SI?

Prototype kilogramme to be abandoned

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Redefining the SI?

#1  Postby newolder » Nov 16, 2018 11:32 am

Redefining the SI conference YouTubed today.
Witness a historic moment; join an open session of the General Conference on Weights and Measures (CGPM)
considering the revision of the SI – including redefinition of four of the base units

The 26th General Conference on Weights and Measures (CGPM) will take place in Versailles in November 2018. At this meeting, we expect the CGPM to approve a resolution to revise the definitions of the International System of Units, the SI, which is based on the second, the metre, the kilogram, the ampere, the kelvin, the mole and the candela (the SI base units).

Over the last 50 years, scientists have measured constants of nature, such as the speed of light and the Planck constant, with increasing accuracy; indeed the metre was already redefined back in 1983 in terms of the speed of light. The inherent stability of these constants make them ideal for underpinning new definitions of the SI units and preparing the measurement system to meet the future demands of science and technology.

If the resolution is approved, the SI will be based on seven physical constants, and thus inherently stable. Most notably, this will mark the end of the last remaining physical artefact in the SI system – a cylinder of metal known as the International Prototype of the Kilogram.

more @ link above
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Re: Redefining the SI?

#2  Postby felltoearth » Nov 16, 2018 11:41 am

And nevertheless Brits will still puzzlingly talk about their weight in stone.
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Re: Redefining the SI?

#3  Postby newolder » Nov 16, 2018 12:21 pm

and here it is in handy business card format-ish...
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Re: Redefining the SI?

#4  Postby Seabass » Nov 16, 2018 6:59 pm

The kilogram is dead, long live the kilogram!

Don't worry, imperial is still alive and well, thanks to us Merkins. :coffee:
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Re: Redefining the SI?

#5  Postby lpetrich » Nov 25, 2018 1:55 pm

Seabass wrote:The kilogram is dead, long live the kilogram!

Don't worry, imperial is still alive and well, thanks to us Merkins. :coffee:

Or at least the American version of English units. For instance, the US gallon and the Imperial gallon differ a little bit: 231 in^3 = 3.785411784 liters, and 4.54609 liters. An Imperial gallon ~ 1.2 US gallons. But in 1959, both the US and the UK agreed on the value of the inch and the pound.

For the pound, this was exactly 453.59237 grams, splitting the difference between the American pound of exactly 453.5924277 g and the Imperial pound of approximately 453.592338 grams (pound avoirdupois).

For the inch, that was 2.54 centimeters.
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