"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."
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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"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."
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.
Your sarcasm was a bit hard to distinguish ;)
There wasn't any sarcasm intended.
Isn't the new definition completely equivalent with the GP's one?