George Porter demonstrates the process of convection, helping to solve the age-old problem of why sauces on our plate stay hot while everything else gets cold. Watch the full fourth lecture of the series: https://www.rigb.org/christmas-lectures/watch/1976/the-natural-history-of-a-sunbeam/candles-from-the-sun?utm_source=youtube&utm_medium=social&utm_term=description George Porter gave the 1976 Christmas Lectures "The Natural History Of A Sunbeam" about the power of light, from the role it plays in stimulating life to supplying energy to our homes. The fourth lecture "Candles From The Sun", where this clip is from, sees George exploring the science behind manmade light and heat. Watch the full series: https://www.rigb.org/christmas-lectures/watch/1976/the-natural-history-of-a-sunbeam?utm_source=youtube&utm_medium=social&utm_term=description Comments have been disabled on this video in compliance with YouTube's COPPA regulations. Our Christmas Lecture series is aimed at children and we have marked the videos to reflect this. You can find out more about COPPA here: https://support.google.com/youtube/answer/9383587?hl=en-GB The Ri is on 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