Learn about the properties of water and how they vary with temperature and salinity
Individual or group activity
Duration: 1 hour
Type of activity: experiment
Materials required for the experiments: a tub to hold water, food colouring, a kettle, a small vial or bottle
This video explains the different states of water (ice, liquid, steam) and their properties. It follows up with two experiments.
The first is about the different densities of cold water and warm water. The second is about the different densities of saltwater and freshwater.
All physics facts are linked to real-world phenomena and the importance of water for all life on the planet.
The activity sheet provides the protocol and materials needed for the experiments. The video can be watched on its own, without carrying out the experiments.