Materials:

• Two glasses
• Salt
• Food colouring
• Water
• Spoon

Instructions:

• In the first glass, add a couple of teaspoons of salt.
• In the second glass, add several drops of food colouring.
• Slowly pour in warm tap water to both of the glasses.
• Stir the salt water until the salt dissolves completely and stir the food colouring in the other glass until the food colouring mixes.
• Slowly pour the coloured water into the salt water glass.
• Watch to see how the coloured water rises to sit above the salt water.