This is a beautiful experiment. Try it a few times to get different patterns/effects
Ingredients and equipment that you will need
Hot and cold water
Pipette or straw
Method and further information
Fill one jar with cold water and the other with hot water. Using a pipette or with your finger over a straw, add a drop of food colouring to each jar.
When you heat something, you give it energy, so the molecules in the hot water are moving much faster. They mix the food colouring into the water very quickly. In the cold water it takes much longer to mix because the molecules are moving more slowly.
Be careful – you should ask an adult to help you with these experiments. Do your experiments in old yoghurt pots, jam jars or bottle tops. Don’t use cups or glasses in case someone thinks it’s a drink.