pauldaniel Posted May 9, 2018 Posted May 9, 2018 https://imgur.com/a/HO7wCg5 in that under water base theres a little water pool so that the divers can dive in and get out of the under water base but in reality if there was a hole like that in the water base the whole thing would fill up with water how does lego justify such a stupidity? Quote
icm Posted May 9, 2018 Posted May 9, 2018 The air pressure inside the base is kept equal to the water pressure outside, so the water doesn't get in. It's the same principle used in diving bells. https://en.m.wikipedia.org/wiki/Moon_pool Quote
pauldaniel Posted May 9, 2018 Author Posted May 9, 2018 that doesnt make sense if there was holes in the side of it the water would leak in Quote
imvanya Posted May 9, 2018 Posted May 9, 2018 You can try this at home: fill the sink with water, take a bottle and push it into the water so that the opening looks straight down. You will see that the water doesn't get into the bottle. As 'icm' said as long as the pressure inside and outside is equal the water is pushing just as hard as the air inside and no-one gets anywhere Quote
MAB Posted May 9, 2018 Posted May 9, 2018 13 hours ago, pauldaniel said: that doesnt make sense if there was holes in the side of it the water would leak in There aren't holes in the sides, they are windows. 9 hours ago, imvanya said: You can try this at home: fill the sink with water, take a bottle and push it into the water so that the opening looks straight down. You will see that the water doesn't get into the bottle. As 'icm' said as long as the pressure inside and outside is equal the water is pushing just as hard as the air inside and no-one gets anywhere Actually, a little water will get in. Atmospheric pressure corresponds to a column of water about 10m high. So if the volume of air inside was originally at atmospheric pressure and you took the base (or bottle) to 10m below the surface, half of it would fill with water (the volume of air would half, as the pressure has been doubled). That is why the air pressure inside the base needs to be increased, to keep the water out. Obviously in a sink you can only go to quite shallow depths so the extra pressure due to the water will not be very high, but the principle is the same, a little water will be getting into the bottle. Quote
LEGO Historian Posted May 9, 2018 Posted May 9, 2018 (edited) The inside the ship area of a moon pool has to be air tight (you need double door entry with an "airlock" between them), or else the ship will sink. It's only this airtight principle that allows a functioning moon pool. Just like the airlock (double doors with a chamber between them) on a space ship is the only way that someone can make a space walk... this same double door system with a chamber between is needed for a moon pool, but it's the concept in reverse. Edited May 9, 2018 by LEGO Historian Quote
imvanya Posted May 9, 2018 Posted May 9, 2018 4 hours ago, MAB said: Actually, a little water will get in. Atmospheric pressure corresponds to a column of water about 10m high. So if the volume of air inside was originally at atmospheric pressure and you took the base (or bottle) to 10m below the surface, half of it would fill with water (the volume of air would half, as the pressure has been doubled). That is why the air pressure inside the base needs to be increased, to keep the water out. Obviously in a sink you can only go to quite shallow depths so the extra pressure due to the water will not be very high, but the principle is the same, a little water will be getting into the bottle. Thanks for a more in-depth comment 'MAB'! I did not get into that much detail as I was not sure I could put it well in enough in English Quote
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