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# Help ! Physics (Fluid Dyanamics)

Longest Straw

Can anyone Please Explain what is The Exact Solution with correct explanation of this question ?

Thanks !

Note by Karan Shekhawat
3 years, 3 months ago

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When we suck water from straw first we basically decrease the pressure inside the straw but the pressure outside the straw remains $$1atm$$. So water rises inside the straw up to the level to equate the pressure inside and outside the straw. As the pressure outside the straw is $$1atm$$ and the pressure inside the straw is $$hdg$$ where $$h$$ is the height of water inside the straw. So $$1 atm=hdg$$. Just find $$h$$(be careful with the units).:)

- 3 years, 3 months ago

Nice explanation , i too understood it

Another but same -

By sucking the water we are decrease the randomness of the molecules ( as it will get more time to oscillate between 2 points), now as you said , for achieving the equilibrium state water rises.

- 3 years, 3 months ago

Thanks! :)

- 3 years, 3 months ago

Which of the solutions did you have trouble understanding?

Once you clarified your doubts, can you help others out by writing a solution that they can understand easily? Thanks!

Staff - 3 years, 2 months ago

- 3 years, 3 months ago

Its like a barometer with water instead of mercury :)

- 3 years, 3 months ago