so we did this thing were there was 5 people making crowns for the king and only one used all gold 4 others tried to jip him and keep the gold for them selfs. but it was a little fishy because they all had diffrent mass's all the same volume tho. So we calculated the mass divided by the volume and got all the densitys than looked at the density of gold an it was 19.3 and the only one with that  was # 4. so 1, 2,3 and 5 jip the king and gave him a crown made out of diffrent material(steel, aluuminum, nickel mercery and others.) By doing this i hae learned how to calculte density and campare mass and volume to materials!