Water Density Tower

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 colours were not mixing only when we first since we squeezed it in too fast. The second time we put the colours in carefully and it WORKED! The layers looked like a rainbow.

Steps

Firstly, get a jug of hot water and 4 measuring cups. Put 400mls of water into the measuring cup. In one measuring cup put 2 tablespoons of sugar. In the second measuring cup put in 4 tablespoons of sugar, in the next put in 6 tablespoons and lastly in the last cup put in 8 tablespoons of water. Stir them all up till they almost look like normal water. In each cup, we put some food colouring. In water with less sugar but more food colour and in cups that have more sugar pt in less food colouring. Lastly, take a syringe and fill it up to 20ml then carefully drop it in making sure to wash out the syringe before you use a different colour. 

Explanation

 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 one with the most density) to the last colour laying on the top( the one with lesser density )