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Ann in Houston wrote: Do your calculations treat the bottle as a full cylinder, or did you stop at the top of the neck? That could make a real difference too. Thanks for being intrigued enough to check it out. I treated it as an exact cylinder - if I wanted to figure out the difference due to curvature, I'd actually have emptied the contents into a proper measuring container, as otherwise I'd have to take into account the curvature on the bottom, the tapering on the top, the size of the neck (at least, the one I used had some water in the neck), and the thickness of the plastic (which looks like it probably isn't even uniform). It's a lot easier to make assumptions :-) (besides which, since I couldn't get an exact measurement, it was all rough anyway). In fact, either our water supplier is cheating us, or the jug is actually a little bigger than my calculation, because it should really be about 1150 cu.in. for a 5 (US) gallon container. -- derek I certainly wouldn't have bothered to figure out the neck and all. The real question was whether or not 12 cubic inches could hold 7.5 gallons. I appreciate you doing it the way you did. |
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