Aresearcher wants to test the solubility ( properly of being dissolved) of salt in water as the temperature of the water increases.

Solubility is a value that measures the extent of a solute dissolving in a solvent. It determines how much of a solute can be added to the solvent wherein it will still dissolve. For a solid solute, in general, when the temperature of the system increases, the solubility of the solute would increase as well. There is a direct relation between them.  Increasing the temperature would mean there would be more energy to dissolve the substance.

Foam, iron, lead

The bigger the number, the more dense
2.3, 7.87, 11.3