When a solid substance is placed in a liquid and dissolves without a change in its chemical structure, the resulting liquid is said to be a solution of the dissolved substance. The liquid used is called the solvent of the substance. As an illustration: Sugar dissolved in water forms a solution of sugar. When the water will dissolve no more sugar, it is said to be a saturated solution at that temperature. A liquid saturated with one substance may still be a solvent for another substance.