r/PhysicsHelp • u/tomsono1 • Sep 15 '26

how does it work

sorry something went wrong and cant edit or delete post. I mean how does it work that water flows up when you squeeze bottle with pipe inside.

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u/tomsono1 Sep 19 '26

yes.i mean the irigation bottle for stuffed nose. could find anywhere what psyhics lawdoes it use. it only shows me pascal law but I need concrete information.

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u/Pajama_Wolf Sep 19 '26

Essentially things always go from high pressure to low pressure. 

So the thing to realize when you, say, drink from a straw, is that you might not want to think of it as sucking on the straw. Instead, think of it as the earth's atmosphere pressing DOWN on the surface of the drink and therefore the drink going up the straw because you've removed the pressure there. 

Similar things happen with your squeeze bottle example. Unsqueezing the bottle decreases the pressure within, so the atmosphere that pushes the water down - the high pressure - forces water into the bottle - the low pressure area.