When salt is dissolved in water, the level of water does change, but the change is so small that it is usually not noticeable. This is because the salt molecules are much smaller than the water molecules, so they can fit in between the water molecules without taking up much space. As a result, the overall volume of the water does not change significantly when salt is dissolved in it.

Additionally, the dissolving of salt in water is a physical change, not a chemical change. This means that the water molecules and the salt molecules do not react with each other to form new substances. Instead, the salt molecules simply disperse throughout the water, taking up the spaces between the water molecules.

If enough salt is added, eventually the concentration of salt will reach a point where the salt molecules can no longer fit in between the water molecules. This point is called the saturation point. At the saturation point, any additional salt that is added to the water will not dissolve, but will instead settle at the bottom of the container.