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[–] matthew-- ago 

What? A kilogram is based on volume of water. One liter is one kilogram.

One meter cubed of water is 1000kg.

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[–] 7e62ce85 0 points 5 points (+5|-0) ago 

Actually that was the old standard - a reference weight.

The new standard is based on a specific constant number of atoms.

From that standard they made a crystalline hyper accurate ball for practical purposes and measurements I guess, but the ball is no longer the standard itself.