‘Gases in the Air’ – A Science Demonstration Assembly

'Gases in the Air’ is a science demonstration assembly mainly given by Tim Harrison of the School of Chemistry, University of Bristol. The Science assembly may also be given by Dr Alison Rivett and by postgraduate chemists trained to deliver this assembly.

Mr Tim Harrison The lecture covers

Throughout the lecture there are demonstrations including some involving liquid nitrogen, oxygen foam, dry ice and a few explosions. With senior audiences the longer version also includes climate change.



Photos of the assembly

The lecture demonstration is usually 60 minutes duration. The lecture has also been presented to members of the wider community, for example parents, visually impaired people, scouts and church groups.

This lecture has been given nearly 2000 times within the last ten years at the time of writing (November 2016) at schools and universities including those in: Australia, China, France, Hungary, Ireland, Jersey, Guernsey, Malaysia, Malta, Namibia, New Zealand, South Africa, Spain, Turkey and the United States.  


There is a charge made for this lecture to cover the cost of transport, disposables, technicianing and subsistence. The lecture may be given up to 3 times per day and different age variations are available. In a primary school it is normal to have Years 2-6 provided they all fit into the hall comfortably. In some schools Y1 and Reception pupils have seen the talk.
Please contact t.g.harrison@bristol.ac.uk for more information.


To deliver the lecture we normally need:

The nearest person to the demonstration should not be closer than 2 metres away.

Notes on the Speakers

Tim HarrisonTim Harrison is the first School Teacher Fellow at Bristol ChemLabS. He is also the Science Communicator in Residence and Director of Outreach.
Prior to this he has been a Head of Chemistry and Science College Director. Tim has taught chemistry for 35 years and his work is mainly in the promotion of chemistry. Tim won the Secondary Education Teaching Award from the Royal Society of Chemistry in 2005 and the 2007 University of Bristol's Engagement Award for the Faculty of Science at the University of Bristol. In March 2010 Tim was awarded an inaugural Hawksbee Award from the Royal Society. Tim is also a Chartered Chemist (CChem) and a Fellow of the Royal Society of Chemistry (FRSC)


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