Bathrooms are full of interesting objects – from bath toys to bars of soap. We are going to use these to test whether they sink or float. Before you begin, gather some more items from elsewhere in the house, a shell, cork, plastic bottle, stone and leaf are all fun to experiment with.
First encourage your child to put them into groups of what will sink and what will float. Take a good look at the materials used for each and then test them out to see which ones float and which sink. This allows your child to consider different materials and help them in observing and grouping objects.
After exploring their properties, the objects can be used to create an underwater world on the bottom of the bathtub.