Energy use worldwide continues to soar and buildings are responsible for a large percentage of this use. Subscribe for regular science videos: http://bit.ly/RiSubscRibe Join new Royal Institution Director Shaun Fitzgerald as he will reveal the surprising physics of hot air, and how using his research led him to revolutionise building ventilation with dramatic reductions in energy usage Watch the Q&A: https://youtu.be/bXeBVTcVOCU Shaun Fitzgerald is the Director of the Royal Institution and a Royal Academy of Engineering Visiting Professor at the Department of Engineering at Cambridge University. He is also the CEO of Breathing Buildings Ltd, a leading technology company pioneering hybrid ventilation systems. He was appointed a Fellow of the Royal Academy of Engineering in 2014. This talk and Q&A was filmed in the Ri on 24 May 2018. --- A very special thank you to our Patreon supporters who help make these videos happen, especially: Ashok Bommisetti, Avrahaim Chein, bestape, Elizabeth Greasley, Greg Nagel, Lester Su, Rebecca Pan, Robert D Finrock and Will Knott. --- The Ri is on Patreon: https://www.patreon.com/TheRoyalInstitution and Twitter: http://twitter.com/ri_science and Facebook: http://www.facebook.com/royalinstitution and Tumblr: http://ri-science.tumblr.com/ Our editorial policy: http://www.rigb.org/home/editorial-policy Subscribe for the latest science videos: http://bit.ly/RiNewsletter