Eli5 – How is the kilogram defined using the second and the Plank constant?

Question

The kilogram used to be defined by a specific chunk of platinum-iridium.

But now it’s defined using the second and the Plank constant, somehow.

Assuming you already have a very accurate measurement of the second, and the Plank constant, how do you combine those two things to get the kilogram?

In: 1

Answer 1

Correction. Three constants combine to define the kilogram.

The second

The Plank constant

The meter

I still don’t understand how they combine.