I’ve seen ‘whoosh bottle’ experiments before but never quite like this. Whether it’s the shape and contour of the glass bottle he used or the grade of ethanol (or a combination of the two), or something else, this is one of the best ‘whoosh’ demos out there. Watch:
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I wonder if lighting it at the top rather than dropping a match in has something to do with the smooth burn down the inside of the jug.
That’s a good observation – I didn’t think of that. I wonder why scientists who demo this prefer matches to stem lighters – because this technique looks so cool!