# Who discovered how to authenticate a gold crown without damaging it?

Apr 24, 2017

Anyway, there should be accounts of this on the web. By tradition, Archimedes used water displacement to measure the volume of a solid denser than water to measure the volume of the solid. He was supposed to be taking a bath, when he noticed the displacement of water: $\epsilon u \rho e \kappa \alpha$, apparently means $\text{I have discovered it}$.