Quote:
Originally Posted by jakoye
Apparently no other metal has the exact density of gold, so if a coin is actually gold, it will have a precise weight related to its circumference and thickness.
I guess they do the same thing with nuggets, although that would seem to be a bit more difficult, due the irregular surface/sizing.
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It's easy with irregular objects too: you fill a measuring cup with a precise amount of water, drop the object into the water, and measure how much the water level rises. This gives you the exact volume of the object, which combined with its dry weight on a scale gives you density.