World's roundest object - video

World's roundest object. 11:43 video:

https://www.youtube.com/watch?v=ZMByI4s-D-Y


Previously:

https://www.homemadetools.net/forum/...655#post174464
https://www.homemadetools.net/forum/...220#post116000
https://www.homemadetools.net/forum/...116#post157491
https://www.homemadetools.net/forum/...259#post169201

Very good information as I was under the impression that they had already defined a kilogram in non physical terms.

So it's not round, it's really, really, really round then. I looked up the definition of interesting in my dictionary..... this wasn't there. ;)

Quote:

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Originally Posted by Drew1966

Very good information as I was under the impression that they had already defined a kilogram in non physical terms.

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They have, or at least are in the process of doing just that. The kilogram will ultimately be defined in terms of Planck's constant, 6.626E-34 joule-sec. When that work is complete and the definition is incorporated into the SI system, all of the basic standards of the metric system will be defined, not in terms of objects in a museum somewhere, but in terms of unchanging universal elements.*

An excellent everyman's explanation of this work is here...

https://www.vox.com/science-and-heal...weight-science

Yes, the kilogram will be defined in terms of a quantum mechanical constant. And so the Luddites who think the inferial pound is better will have to brace themselves for the inevitable since the pound is defined in terms of the kilogram. (1 lb = 0.453592 kg).

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* If Planck's constant, the speed of light, etc. ever evidence change, it will be necessary to completely rewrite all of physics. Given the success we've had building stuff based on our assumption that they are invariant, that's unlikely to happen.

Quote:

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Originally Posted by mklotz

And so the Luddites who think the inferial pound is better will have to brace themselves for the inevitable since the pound is defined in terms of the kilogram. (1 lb = 0.453592 kg).

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-Wouldn't this lead to "Mass Hysteria" amongst the Imperial proponents, then?:D

Quote:

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Originally Posted by mklotz

They have, or at least are in the process of doing just that. The kilogram will ultimately be defined in terms of Planck's constant, 6.626E-34 joule-sec. When that work is complete and the definition is incorporated into the SI system, all of the basic standards of the metric system will be defined, not in terms of objects in a museum somewhere, but in terms of unchanging universal elements.*

An excellent everyman's explanation of this work is here...

https://www.vox.com/science-and-heal...weight-science

Yes, the kilogram will be defined in terms of a quantum mechanical constant. And so the Luddites who think the inferial pound is better will have to brace themselves for the inevitable since the pound is defined in terms of the kilogram. (1 lb = 0.453592 kg).

--
* If Planck's constant, the speed of light, etc. ever evidence change, it will be necessary to completely rewrite all of physics. Given the success we've had building stuff based on our assumption that they are invariant, that's unlikely to happen.

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It's all comparisons of one thing to another which is exactly what we have now, it will just be a different process by different people arriving at a different system of measurements no better or worse than what we have now, just different. What are we comparing and what are we comparing that to? Days or sols? And on which celestial body? Miles or kilometers? Cubits or rods? How Long is Chinese isn't he? Everything is relative to each individual and trying to "standardize" that or "universalize" it is folly. what are the odds that if you locked 10 brilliant minded individuals away without contact with one another they would come to the same basis let alone system for these measurements? So how far does light travel in one year? A year on what planet? Everything is relative.

Most of the time they have a "Demo" unit that perhaps didn't pass muster to be "best," which they keep around just for visitors to touch.