How long would it take to boil the ocean with all the kettles in the UK?

University of Oxford Mathematician Dr Tom Crawford calculates how long it would take to boil the ocean using the method of Fermi Estimation. Original article by TRM intern Becca Tanner. Becca is an undergraduate student at the University of Oxford studying Earth Science. Read her series of articles on the technique of Fermi Estimation at the links below. Part 1: Envelopes at the ready! https://tomrocksmaths.com/2022/01/10/fermi-problems-part-1-envelopes-at-the-ready/ Part 2: Don't sweat the small stuff https://tomrocksmaths.com/2022/01/31/fermi-problems-part-2-dont-sweat-the-small-stuff/ Part 3: Where is everybody? https://tomrocksmaths.com/2022/02/07/fermi-problems-part-3-where-is-everybody/ The calculation is broken down into several smaller steps which together lead to an approximation for the final answer. Step 1: What is the volume of a kettle? Step 2: How many kettles are there in the UK? Step 3: How much water can we boil at once? Step 4: What is the volume of the ocean? Step 5: How many rounds of boiling are required? Step 6: How long does it take for a kettle to boil? Produced by Dr Tom Crawford at the University of Oxford. Tom is an Early-Career Teaching and Outreach Fellow at St Edmund Hall: https://www.seh.ox.ac.uk/people/tom-crawford For more maths content check out Tom's website https://tomrocksmaths.com/ You can also follow Tom on Facebook, Twitter and Instagram @tomrocksmaths. https://www.facebook.com/tomrocksmaths/ https://twitter.com/tomrocksmaths/ https://www.instagram.com/tomrocksmaths/ Get your Tom Rocks Maths merchandise here: https://beautifulequations.net/collections/tom-rocks-maths