3rd graders carried out an experiment in the laboratory to find out about some basic properties of water: water is colourless (it has no colour), odourless (it has no smell) and tasteless (it has no flavour). They had to compare a glass of water and a glass of orangeade by looking at both liquids, smelling them and tasting them. Then they poured a bit of oil in the water and observed what happened: oil and water don’t mix because water is heavier than oil!