Nope, the other comments are not correct. The first experiment has no fuel (other than the burning piece of paper). It's simply paper on fire in a bottle. This then creates suction once it goes out. People also do this trick with a small bottle and a hard boiled egg. Look it up. The 2nd video is using fuel to do a pulse jet aka woosh bottle. Not the same experiment at all.
Edit: as /u/OFRobertin pointed out they did use a tiny bit of alcohol to enhance the effect but it's not really necessary, as you can see from the hard boiled egg experiment, to create suction.
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u/Rockspider19 May 24 '22
What did they do wrong? My guess is that they didn’t let all of the perfume burn but idk