Editing Talk:2073: Kilogram
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:If Planck's constant isn't constant then we get two functionally different concepts of mass and we have to decide if we stick with the new definition or go back to (some equivalent of) the older one. | :If Planck's constant isn't constant then we get two functionally different concepts of mass and we have to decide if we stick with the new definition or go back to (some equivalent of) the older one. | ||
:By the way the confusion over the definition of a lb was settled long ago. The lb is defined in terms of the kg and is a unit of mass. The claim that the lb is a unit of force is a deliberate obfuscation perpetuated by bad physics teachers who understand neither physics nor the history of physics. [[Special:Contributions/108.162.219.58|108.162.219.58]] 19:52, 19 November 2018 (UTC) | :By the way the confusion over the definition of a lb was settled long ago. The lb is defined in terms of the kg and is a unit of mass. The claim that the lb is a unit of force is a deliberate obfuscation perpetuated by bad physics teachers who understand neither physics nor the history of physics. [[Special:Contributions/108.162.219.58|108.162.219.58]] 19:52, 19 November 2018 (UTC) | ||
− | :Since they're proposing to measure the gravitational force exerted on a unit of mass against the force exerted by an electromagnetic field (instead of | + | :Since they're proposing to measure the gravitational force exerted on a unit of mass against the force exerted by an electromagnetic field (instead of coomparing the downward force exerted on two masses), the new definition ''isn't'' a constant. For instance, on the moon such a scale would define 1kg as about 13.3lbs! The "new official definition" is a bad one. [[User:ProphetZarquon|ProphetZarquon]] ([[User talk:ProphetZarquon|talk]]) 08:36, 17 November 2018 (UTC) |
You could not define the kilogram in terms of electric force when you defined the Amp in terms of the current that creates a given force. But by defining the amp in terms of numbers of elementary charges per second and setting Avogadro and other constants by fiat, you break the circle. [[Special:Contributions/162.158.38.190|162.158.38.190]] 23:54, 16 November 2018 (UTC) | You could not define the kilogram in terms of electric force when you defined the Amp in terms of the current that creates a given force. But by defining the amp in terms of numbers of elementary charges per second and setting Avogadro and other constants by fiat, you break the circle. [[Special:Contributions/162.158.38.190|162.158.38.190]] 23:54, 16 November 2018 (UTC) | ||
− | + | sic | |
− | In the Netherlands, we use the metric system. We also use the term "pond" to mean pound. However, we use metric pounds. Those are 0.500 kilogram, so it is actually easy to use. | + | In the Netherlands, we use the metric system. We also use the term "pond" to mean pound. However, we use metric pounds. Those are 0.500 kilogram, so it is actually easy to use. |
US weight and length units definition is strictly based on metric system: | US weight and length units definition is strictly based on metric system: | ||
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: The varying g problem is already compensated for in the way you describe (otherwise the Kibble balance wouldn't be useful), ProphetZarquon is just spreading misinformation. [[User:Arcorann|Arcorann]] ([[User talk:Arcorann|talk]]) 07:55, 18 November 2018 (UTC) | : The varying g problem is already compensated for in the way you describe (otherwise the Kibble balance wouldn't be useful), ProphetZarquon is just spreading misinformation. [[User:Arcorann|Arcorann]] ([[User talk:Arcorann|talk]]) 07:55, 18 November 2018 (UTC) | ||
− | In the What If "A Mole of Moles," Randall states in his estimates, "Anything I can throw weighs one pound. One pound is one kilogram." [https://what-if.xkcd.com/4/] | + | In the What If "A Mole of Moles," Randall states in his estimates, "Anything I can throw weighs one pound. One pound is one kilogram." [https://what-if.xkcd.com/4/] |
Let's see... All the things this proposed change would mess up. (even assuming that Black Hat meant 1 Kilogram = 1 mass-pound) | Let's see... All the things this proposed change would mess up. (even assuming that Black Hat meant 1 Kilogram = 1 mass-pound) |