Editing Talk:2073: Kilogram

Jump to: navigation, search
Ambox notice.png Please sign your posts with ~~~~

Warning: You are not logged in. Your IP address will be publicly visible if you make any edits. If you log in or create an account, your edits will be attributed to your username, along with other benefits.

The edit can be undone. Please check the comparison below to verify that this is what you want to do, and then save the changes below to finish undoing the edit.
Latest revision Your text
Line 73: Line 73:
 
: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 comparing 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)
+
: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. {{unsigned ip|162.158.89.61}}
+
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:
Line 94: Line 94:
 
: 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/] {{unsigned ip|162.158.75.178}}
+
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)

Please note that all contributions to explain xkcd may be edited, altered, or removed by other contributors. If you do not want your writing to be edited mercilessly, then do not submit it here.
You are also promising us that you wrote this yourself, or copied it from a public domain or similar free resource (see explain xkcd:Copyrights for details). Do not submit copyrighted work without permission!

To protect the wiki against automated edit spam, we kindly ask you to solve the following CAPTCHA:

Cancel | Editing help (opens in new window)

Template used on this page: