Adding some salt and using a 9V battery you can split water into hydrogen and oxygen. It's called electrolysis and since 2H₂O --> 2 H₂ + O₂, you also visualize what electrode releases hydrogen and what oxygen [more: buff.ly/3i0xLyO] [video: buff.ly/3oA2s0m]
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You then can use the hydrogen to make electricity you can sell. Then buy 0.1 battery and repeat the process!
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Still missing some upside down tube to capture the hydrogen.
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What happens if the same battery is connected to an ignition circuit above the water? 🤔
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Using electrolysis, I once was able to help a friend via telephone to identify plus and minus of a power supply he wanted to connect to a radio.
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