Avsnitt 5

Maddie visits a singing group and the children help us find out how we use our mouths, vocal chords and lungs to make different sounds when we sing and speak. Maddie uses a special machine to measure the different high and low sounds that we make. Next, she visits a trombone factory to see how copper and zinc metals are made into brass trombones . We see how the parts are bent and moulded into different shapes to make the new parts of the trombone and Maddie uses a special gadget to measure the temperature and find out how the metals are heated and stuck together.