Recent content by twoxtwo

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    Velocity of air thru a tube - 4th grade science fair project

    OK...now I think we have it...at least well enough that I can explain what's going on in the experiment to my son and his science fair partner (his mom is the one who came up with this idea). He addresses friction in his report and understands it enough so that I think he will be able to...
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    Velocity of air thru a tube - 4th grade science fair project

    This explanation seems to address the fact that the vertical tube is the same - yes there are three vertical tubes but they are identical in diameter and length...and only the lower tube is different - so I'm confused, a little, by your subsequent explanation...that i responded to just before...
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    Velocity of air thru a tube - 4th grade science fair project

    Got it...I actually understand it now...(thanks to that physics and math in college...only it's been a while since I've actually had to think about it) There are three vertical tubes and each has a different diameter lower tube. That's what's changing, assuming constant air pressure in pump...
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    Velocity of air thru a tube - 4th grade science fair project

    sorry - i didn't finish that sentence...the 5/8" rose higher - which agrees with the formula you just gave... the first trial was with a flex tube of 3/8" and a ping pong ball placed in the vertical tube. It did not rise. We decided there was too much air flow around the ping pong ball in the...
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    Velocity of air thru a tube - 4th grade science fair project

    the balloon is not used as the air source but rather to attach the vertical stationary tube (the one the ping pong ball sits in) to the lower flexible tube. The balloon is the white stuff at the bottom of the vertical tube. The balloon air pump is used to as the source of air pumped into the...
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    Velocity of air thru a tube - 4th grade science fair project

    Hi...can anyone help out explain the relationship of diameter to velocity of air flow thru a tube for the following science experiment. A photo is attached. The question they are trying to answer thru the attached experiment is: Does the diameter of the tube affect how high a ping pong ball...
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