Don't know why this was downvoted. But here is the answer [1]: "The new definition only became possible when instruments were devised to measure the Planck constant with sufficient accuracy based on the IPK definition…
Is there a reason why this took so long?
It seems like a lot of the comments are here from Swedes, and probably that is the working definition here for what consists the common perception. Is there a simple argument why it was not South African special police?…
Don't know why this was downvoted. But here is the answer [1]: "The new definition only became possible when instruments were devised to measure the Planck constant with sufficient accuracy based on the IPK definition…
Is there a reason why this took so long?
It seems like a lot of the comments are here from Swedes, and probably that is the working definition here for what consists the common perception. Is there a simple argument why it was not South African special police?…