Hi.
It's Mr. Andersen and this is AP Physics essentials video 5.
It is on objects.
And here is an object right here.
It is the kilogram.
And this really is the kilogram.
It is stored in Paris.
The kilogram is the only unit that is based on the mass of an artifact, an actual object which is somewhat problematic.
And so Avogadro Project is working to define this based on Avogadro's Number.
And so they have created the most spherical object that humanity has ever made.
