SLAS

Kilogram

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Just what is a kilogram? Officially, it's a metallic cylinder housed in Paris. There are several teams working on a new way to define mass by using physical constants instead of a physical mass. As much as we use various weights and measures we seldom think about how they are defined. I can't say this will change my life, but I will think about it next time I order a kilo of steak for dinner.

http://www.livescience.com/55177-kilogram-being-redefined.html