Laura and her daughter worked on the Science Experiment: Lava in a Glass and they wanted to share it with their friends.
Here is a simple demonstration that can lead to an exploration of density with liquids. You can demonstrate this activity to your child, collaborate with them, or they may wish to work independently. In order to extend their learning, you can provide a variety of liquids and solids. Ideas for liquids with varying densities include honey, corn syrup, oils, dish soap, milk, water, and rubbing alcohol. Ideas for solids include sugar, sea salt, and sand. Enjoy exploring!
Materials:
glass
oil
salt
food colouring
Step 1: Fill the glass about ¾ full of water.
Step 2: Add some food colouring.
Step 3: Slowly add some oil to the glass. What happens to the oil. Why?
Step 4: Sprinkle salt on top of the oil and watch what happens next!
Explanation:
The oil floats on top of the water because it is lighter than the water. However, the salt is heavier than the oil so it sinks down into the water, pulling some oil down with it. Then the salt dissolves into the water and the oil floats back up to the top!
