Redefining The Kilogram (Through The Watt Balance) - [Veritasium]
3 replies, posted
[video=youtube;Oo0jm1PPRuo]http://www.youtube.com/watch?v=Oo0jm1PPRuo[/video]
That's alot of josephson junctions. :science101:
(See his previous video on the [URL="https://www.youtube.com/watch?v=ZMByI4s-D-Y"]Silicon Sphere[/URL])
This video made me wonder whether there would be parts of space where the meter would be consistently defined differently. Isnt the speed of light changed by dramatic gravitational forces and dense material clouds, etc?
It seems to me that many of the measurements they are defining are potentially only constant and precise on earth in normal conditions. But I am terribly uneducated in physics.
[QUOTE=Smeetin;52465230]This video made me wonder whether there would be parts of space where the meter would be consistently defined differently. Isnt the speed of light changed by dramatic gravitational forces and dense material clouds, etc?
It seems to me that many of the measurements they are defining are potentially only constant and precise on earth in normal conditions. But I am terribly uneducated in physics.[/QUOTE]
Speed of light is constant universally, its just the relative velocity depending upon the material it passes through (And since there's no matter in vacuum that's the true speed of light). Gravitational lensing only effects the direction not the speed.
[QUOTE=Smeetin;52465230]This video made me wonder whether there would be parts of space where the meter would be consistently defined differently. Isnt the speed of light changed by dramatic gravitational forces and dense material clouds, etc?
It seems to me that many of the measurements they are defining are potentially only constant and precise on earth in normal conditions. But I am terribly uneducated in physics.[/QUOTE]
The constant c refers to the speed of light [I]in a vacuum[/I]. When measured in a single inertial frame, light, or pretty much anything else, cannot move faster than this constant.
Sorry, you need to Log In to post a reply to this thread.