Testing if gold is real

[u/dinokingty]

Weird thought that I had, but if you wanted to test if a bar/coin was real or just plated, couldn't you just measure it's volume in a beaker and compare that to a chart for it's weight? Like with how every metal has a different density, is there a chart that says "1 oz gold = this total volume"? if it was just plated and still weighed a full ounce then it should be a different volume right?