Unique and one-of-a-kind water
Water is a transparent, colourless, odourless, tasteless liquid. Water is the source of life: all living things contain water. Water dissolves many substances, so sugar stirred into tea dissolves. In nature water occurs in three states: solid (ice, snow, hail), liquid (water, rain) and gas (water vapour). Ice melts into water (melting), water freezes into ice (freezing), water turns to vapour when heated (evaporation), vapour cools into water (condensation). Ice is lighter than water, so it floats.
Experiments: 1) stir a teaspoon each of sugar, salt and sand into three glasses of water. Which dissolves? 2) Put an ice cube in a glass of water: does it sink or float? Conclusion: ice floats. 3) Leave an ice cube on a saucer and watch how it melts. Safety: use only cold water and do not taste the mixtures.