You need a thermometer, two dishes, some warm water, some cold water, and three people to do this task: one to call out the time; one to read the temperature and one to write down the result.

Place a thermometer bulb in a dish of cold water and leave it there for five minutes.

Now place the thermometer bulb in a dish of very warm water. Write down what the thermometer shows every 10 seconds.

Each person in the team change places and repeat the task. Look to see if the results were always the same.

Find a way of showing your results.