These experiments can so easily be done at school. It is a bit like Doctor Who in which ordinary objects are connected together and the Doctor mutters gibberish and then extraordinary things happen. The key one (of a few) here is the Bunsen in the centre of a 1 m copper rod. Heat is swept up the rod by an electric current. Down stream from the flame the temperature is lower than the corresponding point upstream from the flame. MP4 recording     MP3 recording -- -- Your browser does not support the audio element.