If an object is twice as dense as another object of the same volume, would the more dense object be able to contain roughly twice as much heat energy, given that the temperature was the same in each?
Doesn't it also depend on the heat capacities of the materials?
When he said "object", I naturally assumed he was talking about solids.I think the OP is actually simply asking about the heat capacities. His question is basically "if I double the density, keeping the volume constant, do I double the heat capacity?". If I recall correctly, this should be true for an ideal gas. I'm not sure if it's still true for a non-ideal gas, which is why I said "roughly".
When he said "object", I naturally assumed he was talking about solids.
Please compare heat capacities of He and Xe.