Water density

A few years ago I came across an article in the Catalyst magazine called "Water in the oceans". Apart from discussing whether or not salty water in the oceans would mix, it had a simple experiment which explored water density.

Start with two cups of water. In one, make a saturated solution salt solution and add food colouring of your choice. To the second cup of water just add different food colouring. Once done, try mixing the two together and you will get two distinctive layers.

This is a great experiment to use in a lesson on density. Super easy and cheap to prepare.

I wish you great lessons!

Karolina