what is it called when something dissolves into something else?\nliquidity\ndensity\nviscosity\nsolubility

Brief Explanations:

Solubility is the ability of a substance (solute) to dissolve in another substance (solvent). Liquidity refers to the state of being liquid or the ease with which a substance can flow. Density is the mass - per - unit volume of a substance. Viscosity is a measure of a fluid's resistance to flow.

Answer:

D. Solubility