1 Kilogram Redefinition - METTLER TOLEDO

Why we're Redefining the kg?
In 1889, the 1st General Conference of Weights and Measures (GCPM) adopted the International Prototype Kilogram (IPK) as the definition for the unit, which has remained unchanged until now. In the past, this meant that measuring mass relied entirely on mass accuracy of a physical object, which, even in spite of advanced security measures, has been prone to uncontrollable changes with time.
During the last several years , METTLER TOLEDO has been privileged to participate in several strategic partnerships that have contributed to the newly established and highly stable kilogram definition. The 1 kg redefinition is part of the biggest overhaul of the International System of Units (SI) since its inception in 1960.
This fascinating video explains the background of the 1 kg redefinition and the effect this change will have on the weighing world. Watch the video now and learn more about the meaning behind "Everything Different, Nothing Changes".
Watch the video now and learn more about the meaning behind "Everything Different, Nothing Changes".
www.mt.com/glo..."
0:27 History of measurement units
1:52 SI
2:35 1 Kilogram
3:02 Kilogram redefinition
6:25 2 Methods
7:12 Kibble balance
9:16 Silicon Sphere
12:53 Kibble balance
14:27 New concept - 3 steps

[@louveldenis]

Beautiful vidéo, thank you Christian and MT. KR, Denis

[@thomassensor9545]

Really amazing video. Great work guys!

[@METTLERTOLEDOLaboratory]

Thank you!

[@stephenpuryear]

I understand that the IPK is cleaned periodically. If we keep it around for a decade or so, I assume that that protocol will continue. Otherwise, finding that its mass has changed after its replacement in either direction will have no usefulness. Great vid!

[@METTLERTOLEDOLaboratory]

Thanks for watching!

[@lunam7249]

a good lab keeps everything

[@GiovasGT]

Mettler Toledo You're the Best!!!!!

[@METTLERTOLEDOLaboratory]

Thank you for watching!

[@GH-oi2jf]

I’m a little unclear on the dissemination part. Ordinary laboratories still need physical reference masses, I assume. Isn’t a physical master reference mass still needed to manufacture those? Is the master reference mass made using a Kibble balance? Does that mean that every national standards laboratory then has its own Kibble balance? What does a Kibble balance cost? Can laboratories subsidiary to the national standards laboratory have its own Kibble balance, or is that impractical?

[@METTLERTOLEDOLaboratory]

Hello, You are absolutely right. Physical references will continue to be used like before. Just at the very top of the traceability chain, at the "realization", Kibble or XRCD experiments replace what used to be the function of the (physical) IPK. There might be developments that these Kibble balances become more widespread and affordable in the future and could theoretically replace physical mass references in other places and other laboratories. At the moment not even all national standards laboratories run primary experiments (like Kibble or XRCD). They rely on the services of other national laboratories or the BIPM's.

[@lunam7249]

yes, that is the point, every lab in the world can build a kibble balance to a budget they like...the NIST one is expensive, you can build 1 at home for $50 usd, accurate to 1%

[@SurenderKumar-nz8um]

Excellently explained.

[@SurenderKumar-nz8um]

Thanks for this information.

[@WayneJohnsonZastil]

How many planks in kg then?

[@METTLERTOLEDOLaboratory]

Thank you for your message. According to METAS, the Swiss Federal Institue of Metrology, the Plank constant has been fixed at 6.626070150 × 10−34 kg⋅m2/s using the IPK (the International Prototype Kilogram) as standard. Please refer to the following video for further details on the definition of kg kzbin.info/www/bejne/oWO7fJ9vjpx9adU