* Gases in the Air – A Science Demonstration Assembly

‘Gases in the Air’ is a lecture-demonstration/science assembly for primary-aged audiences, mainly given by either Tim Harrison or Dr Alison Rivett, of Bristol ChemLabS at the University of Bristol. STEM Ambassador postgraduate chemists also deliver the talk.

photo collage of moments in the demonstration

Throughout the talk  there are exciting demonstrations involving liquid nitrogen, oxygen foam, dry ice and a few explosions! The assembly is suitable for all primary age groups, even reception classes.  The science assembly is approximately 60 minutes duration, depending on the age of the audience.

At the time of writing, this demonstration assembly has been seen by more than 50,000 primary pupils in 4 continents and in more than 15 countries ranging from South Africa, Australia, Singapore and Malta.  


"Dear Dr Alison
Thank-you for your demonstration of chemistry.  My favourite experiment was when your hydrogen and helium balloons blew up.  This experience was great and I would highly recommend the show to others

A pupil at Winchcombe School, Gloucestershire

"The best assembly EVER!"

A pupil at Ashley Down School in Bristol

scanned KS1 Thank You cards


There is a charge made for this lecture to cover the cost of transport, disposables, technicianing and subsistence.

Please contact Tim Harrison at t.g.harrison@bristol.ac.uk


To deliver the lecture we normally need:

Notes on the Speakers

Bristol ChemLabS Outreach was awarded a Big Tick in the Business in the Community’s Awards for Excellence 2009. An independent panel judged the project's outreach and engagement activities with schools, teachers and students of all ages to be making a strikingly positive and sustained impact on the community. It has also has been ‘Highly Commended’ in the national Business in the Community's Bank of America Merrill Lynch Education Award. The Big Tick award was re-accredited in 2010 and 2011.

Big Tick logo

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