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Does anybody know how to make a self-inflating device which is not powered?

I want to create a self -inflating cushion that is not mains powered. It could be battery operated but does anybody know how to do this in a way that does not[ involve power? thanks

alexhalford8 years ago
You could use a system that mixes sodium carbonate and an acid (eg vinegar). Or, more violent but effective: Car air bags use an explosive charge that produces a lot of gas very quickly. If you look around, air bags shouldn't be too hard to find (try scrap yards etc) You mention it's for a cushion, so it may produce too much gas and burst your cushion but some imaginative tweaks ought to fix that (eg reducing the charge in the air bag).
vince 098 years ago
I've seen emergency life jackets that use small CO2 cans. you pull a string and it inflates I'm sure you could rig up an electric moor to pull the string and than put that device on the cushion you are wanting to inflate