Access the full demonstrator in the Inspiring Science Education website. You can also download the PDF.
In this demonstrator we have to recall natural concepts as the density, the upthrust and the Newton’s law of universal gravitation, in order to calculate the density of the gas planets in our solar system. Then the students can compare these values of density with the density of water. That is critical to see if the planet would float on the surface of a giant cup of water!