Why can i suck with a straw sitting 5 m above ground with the bottle at the ground but can do it the other way deep under water

Question

fortytherapper · Answer

Pressure, I guess

raffle_snaffle · Answer

can or can't?

tejas21 · Answer

Ya sorry cant donit other way round..thank you for rectifying..

tejas21 · Answer

Oh ya the pressure might be a case but how ?? @FortytheRapper

fortytherapper · Answer

Atmospheric maybe. Going underwater can be the same as double the pressure we feel on the surface. Force exerted increases

vihangjumle · Answer

Because you balance the pressure inside and outside

cj7529 · Answer

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Hey,
Above water we have this situation. P2 is atmospheric pressure, and P1 is atmospheric pressure minus the little bit you suck out. This results in the liquid being pushed down by the atmosphere, and pulled through the straw. 

I can't really understand what you mean in the underwater case, but does this help?