Traceable Standards - The Kilogram

Marc

Hunkered Down for the Duration with a Mask on...
Staff member
Admin
#1
For 130 years, the kilogram has supposedly weighed precisely one kilogram. The US government isn't so sure. The precise weight of the kilogram is based on a platinum-iridium cylinder manufactured 130 years ago and is kept in a vault in France at the International Bureau of Weights and Measures. Forty of the units were manufactured at the time, to standardize the measure of weight. But due to material degradation and the effects of quantum physics, the weight of those blocks has changed over time. That's right, the kilogram no longer weighs 1 kilogram, according to the National Institute of Standards and Technology. And it's time to move to a different standard anyway. A proposed revision would remove the final connection to that physical bit of matter, said Ambler Thompson, a NIST scientist involved in the international effort. 'We get rid of the last artifact.'
 
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BradM

Staff member
Admin
#2
For 130 years, the kilogram has supposedly weighed precisely one kilogram. The US government isn't so sure. The precise weight of the kilogram is based on a platinum-iridium cylinder manufactured 130 years ago and is kept in a vault in France at the International Bureau of Weights and Measures. Forty of the units were manufactured at the time, to standardize the measure of weight. But due to material degradation and the effects of quantum physics, the weight of those blocks has changed over time. That's right, the kilogram no longer weighs 1 kilogram, according to the National Institute of Standards and Technology. And it's time to move to a different standard anyway. A proposed revision would remove the final connection to that physical bit of matter, said Ambler Thompson, a NIST scientist involved in the international effort. 'We get rid of the last artifact.'
Great post, Marc. I had remembered hearing something about this in the past.

I would surmise that part of the revelation surrounds the increased technical proficiency and uncertainty estimations.

:tg:

It's kind of like what my mom told me the other day. "I'm surprised that you and your brother are still alive. All the things we didn't know then, that will kill you now!! "

:lmao::tg:
 
D

dv8shane

#4
For 130 years, the kilogram has supposedly weighed precisely one kilogram. The US government isn't so sure. The precise weight of the kilogram is based on a platinum-iridium cylinder manufactured 130 years ago and is kept in a vault in France at the International Bureau of Weights and Measures. Forty of the units were manufactured at the time, to standardize the measure of weight. But due to material degradation and the effects of quantum physics, the weight of those blocks has changed over time. That's right, the kilogram no longer weighs 1 kilogram, according to the National Institute of Standards and Technology. And it's time to move to a different standard anyway. A proposed revision would remove the final connection to that physical bit of matter, said Ambler Thompson, a NIST scientist involved in the international effort. 'We get rid of the last artifact.'
They have been talking about basing it on either Planck's or the Avargardo constant one is charge based the other is volume based. The NPL has this http://www.npl.co.uk/reference/measurement-units/si-base-units/the-kilogram-(kg) that explains both. My understanding is if the use the Avagardo constant then mass will be directly related to the mol. Any thoughts?
 

Ron Rompen

Trusted Information Resource
#8
Just to clear up a (fairly major) point here; the kilogram is not a unit of weight, but reather is a unit of MASS. The degradation of the standard cylinder is compounded by the (slight) change in the mass of the earth over the years. It is not yet determined (don't know if anyone has even looked into it yet) whether the effects compound or negate each other.
 
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