2019 redefinition of the SI base units

Re:2019 redefinition of the SI base units by Willson50 on Monday July 01, 2019 @04:42PM (#20329531)

"The kilogram is the mass of a body at rest whose equivalent energy equals the energy of a collection of photons whose frequencies sum to [1.356392489652×10^50] hertz."

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Re:2019 redefinition of the SI base units by effie on Monday July 01, 2019 @04:52PM (#20329625)

Glad that is a deprecated formulation. One never has collection of photons of exact frequency of net mass 1kg. Also 1kg weight can't be realistically entirely turned into photons.

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Re:2019 redefinition of the SI base units by saagarjha on Monday July 01, 2019 @05:54PM (#20330132)

Your sarcasm was a bit hard to distinguish ;)

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Re:2019 redefinition of the SI base units by effie on Tuesday July 02, 2019 @11:28AM (#20336055)

There wasn't any sarcasm intended.

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Re:2019 redefinition of the SI base units by marcosdumay on Monday July 01, 2019 @06:01PM (#20330179)

Isn't the new definition completely equivalent with the GP's one?

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