Density of fresh and salty water

Today we found out a bit about the density of different types of water. Below is the experiment that we observed
 What you need:

• 1 Large jar filled with water- let it sit for a couple of hours 
• 1 Large jar of salted water- let it also sit for a couple of hours 
• Food colouring 
• Ice cubes 

What to do: With the jar of unsalted water- float an ice cube on the water. The cooled water by the ice will sink. Put a drop of food colouring on the ice cube to reveal the cooled water sinking to the bottom.

 Try the same thing with the jar of salted water - float an ice cube on the water. The salt would have dissolved and increased the density of the water. Put a drop of food colouring on the ice cube to reveal the cooled water spreading out and sitting on the top. The dyed water will stop sinking at the top of the “bottom water”.

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 You can do this at home and see the effect for yourself.