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Because they definitely had a good supply of helium and/or hydrogen laying around to fill these balloons with, when levers and wheels were too advanced.
Right.
Clearly they used methane.
Crowds of farm labourers during flood season, all lined up just waiting for their turn to fart into the balloon.
It would be another age before they realized they could fill the balloons twice as fast using camel farts.
You know you can make hydrogen out of water right? You just need high voltage electricity.
You need high current, not voltage. Electrolysis of water starts somewhere around 1.5V
Likewise, why would they bother with balloons, at all? We know they were highly advanced, it seems more likely they'd just skip to planes?
Which the ancient Egyptians clearly had
I'm assuming you subscribe to the Baghdad battery idea? Even that would produce only a tiny amount of electricity if it did at all. It definitely couldn't be used for this or even the lighting idea some crazy people support. It may have produced a tiny jolt and have been used for religious purposes as they couldn't explain the small shock.
I'm taking the piss