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This question already has an answer here:

In this video what is that creates the propulsion of the bottle? Is it a chemical reaction or simply a state change? https://m.youtube.com/watch?v=VxvJcPToXb0

I think is the propane that passes from liquid to gas, nothing more.

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marked as duplicate by user15489, bon, Todd Minehardt, M.A.R. ಠ_ಠ, user467 Sep 12 '15 at 2:12

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  • $\begingroup$ Apparently the latter. $\endgroup$ – Ivan Neretin Sep 11 '15 at 22:59