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What happens when you push a balloon full of air into a body of water, that's in space?

My 8-year-old son asked this question and i couldn't give him a definite answer. So he's wondering if it would do the same thing as a balloon pushed underwater in the bathtub (which kind of makes sense to me, due to the density differences, not just gravity alone).

But I told him I'd ask those more knowledgeable than me.

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Terracotta Air Cooling🧊
  • As someone currently using a swamp cooler in a desert climate with daily temps around 40C, that statement is absolutely misleading!

    A more accurate statement could be that they cycle 125-550L of water a day, but aside from what's evaporated, it's basically a closed-loop system, with very little water waste or loss.

    evaporative coolers are very common in desert climates in the US. they work really great up to about 60% humidity and cost less than 10% to operate compared to 'regular' AC. they use little power (can easily be solar powered), and do not pollute.

    i have both an evaporative cooler and an AC unit and have rarely felt the need to use the AC - the evap works exceedingly well for keeping the temps tolerable.

    the only real downside is that it's not just push a button and all your problems are solved. you need airflow. usually these things are mounted where the output vents into a central hallway or room, and you direct the flow of cool air by opening windows or doors - the path between the cooler vent and the open "exhaust" to the outside is what stays the coolest. Opening the whole house requires turning the evap cooler's fan to a higher speed, but that's so wasteful and we're not ever using the whole house at once. i also turn it off when there's a thunderstorm (because obviously the humidity spike makes this useless). It also doesn't get used in the winter - it gets a canvas cover and some padding to seal off the air gaps so the house doesn't get too cold and drafty.

    it's clear there's a lot of people here who haven't ever used or even seen this type of cooler, but i assure you this is common, and probably the most cost-effective summer cooling.

  • Can i replace the 19mm nuts on my ebike's rear axle with 18mm nuts?
  • thank you! this was the answer i was hoping to find. there's no torque arm, so I'll stick with carrying two wrenches.

    as an aside, does anyone have any recommendations for cranksets for a '92 rockhopper? it's got shimano biopace on it (what it came with) which is now warped after years of abuse, and I'm hoping to turn that into a commuter for the days I don't like taking the ebike.

  • Can i replace the 19mm nuts on my ebike's rear axle with 18mm nuts?

    Context: my ebike has 19mm nuts on the rear axle (and 15mm on the front). I have an old Proto wrench that's a 15mm/18mm, so i'm wondering if i could replace the rear nuts with 18mm nuts instead, so i can carry around one less wrench.

    The bike is an Eahora Cupid with a 1000w motor if that makes any difference.

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    InitialsDiceBearhttps://github.com/dicebear/dicebearhttps://creativecommons.org/publicdomain/zero/1.0/„Initials” (https://github.com/dicebear/dicebear) by „DiceBear”, licensed under „CC0 1.0” (https://creativecommons.org/publicdomain/zero/1.0/)VO
    vomitaur @slrpnk.net
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