Good luck with the exam

Agreed. Sodium-ion batteries are likely to have a very important role in the future of electrification. Exciting times

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Great question! Iron has been one of the most critical materials, defining an entire age, due to its good mechanical properties. Iron smelting itself has been around for a long time, but pure iron is perhaps too ductile to be useful for most industrial applications. Early smelters learnt, likely through trial and error, that the addition of carbon enhanced the mechanical properties to make steel. Later developments in material science, then allowed us to more systematically understand what was going on, with phase diagrams a useful way of mapping the composition-phase relationship towards engineering materials with the properties we are aiming for. It's quite a powerful approach which hopefully will inspire people to learn more about material science.

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You're right. This video was from a few years ago and the source was a few years back before then. Much has changed since then with price drops a lot more rapid than many had expected

Fuel cell systems could certainly power boats. You could have a solar system also but would need to have an electrolyser to split the water to hydrogen and then compress it for storage which is a bit costly and complex at small scale. A battery system could be a simpler and more efficient way to collect solar; working alongside a fuel cell system

@@BillyWu If I understand how fuel cells work then its comparable to a normal gas engine as far as power density but with hydrogen as fuel. If you have a solar/battery setup and the fuel cells as the backup you could effectively live off grid and never need to invest anything more than the initial cost of the whole system rather than having to rely on something like a diesel engine. I love the idea of only having to earn enough for repairs and food on a boat and this could be an option someday for making boat living a more viable option.

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Thanks. The system is a few years old now so probably better components exist now. Previously it was quite expensive so getting the economics right was challenging for commercial via ability as a generator

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Hope you found it useful

Yeah seemed to work well in the rain but tried my best to generally keep it dry as over time I suspect it could cause issues

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@@BillyWu anytime

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Thanks. Glad to hear these videos have been helpful

Sure. Here's another video where I discuss different ways of strengthening metals, including heat treatment and TTT diagrams kzfaq.info/get/bejne/bdJ9YLxlvdTIo3k.html

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Thanks and glad to hear it was useful. Thanks for the suggestion for future videos. I have a list of potential next ones, but just need to find the time to create them

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Thanks. Glad to hear it was useful