• If we have a glass of water and then we put a rock into it , it flows and the water level increases

• If we have a glass of water and mix it with something like salt or sugar , they become a substance but the water level does not increase , why ?

• A normal glass of water will have water molecules but they will have space in-between them

• Now if we take some salt and put it inside the water the salt will fill up the empty space of water

• As you can see in the diagram , the white stuff are salt which are filling up the water molecules which look blue , thus salt and water become like a whole , a mixture , water molecules attract the salt molecules and that is why they are together

• The positively-charged side of the water molecules are attracted to the negatively-charged chloride ions and the negatively-charged side of the water molecules are attracted to the positively-charged sodium ions.

If you put a stone inside water the water level increases as the particles increase

• The molecules of water before the stones were put was at normal level

• Now when we add something to the water the water level ha increased

• Why ? its because the molecules aka particles were increased in the water while adding the stones thus the stones particles increased the level of water by occupying space

• If a amount of water contained 90 particles ( assumption ) then the water level will be normal but if we add a stone containing 30 particles then the while glass or container will have 120 particles of substance within it , thus there will be a increase