MadSci Network: Physics

Subject: Why does water rise higher in a straw with a wider diameter?

Date: Fri Feb 2 12:20:40 2001
Posted by Donna
Grade level: 7-9 School: St. Francis of Assisi School
City: Ann Arbor State/Province: Michigan Country: U.S.A.
Area of science: Physics
ID: 981134440.Ph

To Whom It May Concern:
I am a tutor for a middle school student.  We are working on a science 
fair project. We are determining if diameter of a straw has an impact on 
the height to which the water will rise in the straw upon sucking.  The 
young man 
thought the smaller the diameter, the higher the water would rise, but 
just the opposite happened.  I am having a hard time finding information 
to explain this phonomenon.  I thought it would have something to do with 
Pascal's Law. Is there someone who could give me an explanation or point 
me in the direction of a book that would help this student to understand 
why his outcome occurred?

Thank you so much for your time and assistance.
Donna Pezda

Re: Why does water rise higher in a straw with a wider diameter?

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