Rainbow Water Density Tower
Aim - To observe how substances with different densities interact
Materials
Glasses - 1 per group
Food colouring (red, blue, green and yellow - you can make purple and orange by combining two colours)
Sugar or Salt (and measuring spoon)
Measuring cup - 1 per colour (you can have 6 colours to work with, or limit it to 4 colours)
Measuring syringes
Water (warm water from a tap or kettle)
Plastic spoons to mix the sugar and food colouring in the water
Pots of water to rinse syringes between each colour
Plastic plates or trays to protect the table from sticky sugar water
Results
The food colouring experiment was successful. There were different stages of each colour. The experiment showed layers of coloured water of different densities, stacked on each other.
Explanation
Look at the websites below and also do research of your own - Then write a paragraph explaining ‘the science’ behind the experiment. Why do we see the results that we did?
The science behind the experiment is quite simple. All of the colours had different amounts of sugar, causing the colours to have different densities and refuse to mix together. Since it won’t mix it instead makes a tower of all the colours from the first colour(The darkest one) to the last colour laying on the top( the lightest colour).
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