Heat causes expansion.
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(most dense to least dense) gold, mercury, water, oxygen
Gold never rusts, oxidizes or tarnishes, except under extraordinary conditions.
I think it is water
A gram of gold looks like a piece of yellowish shiny metal.
The density of a given substance will not change as long as the purity remains the same. That is, if both the ring and the necklace are made of 14 karat gold, they will have the same density, but the overall mass of gold in each item is different.