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Thread: pressure problem

  1. #1 pressure problem 
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    Pressure of gas inside the tube in A is the same as atmospheric pressure
    Pressure of gas inside the tube in B is more than the atmospheric pressure

    That's very Okay and very easy to imagine

    but my problem is with C
    I can't imagine why is the pressure of gas inside the tube less than the atmospheric pressure?

    Thanks


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  3. #2  
    Comet Dust Collector Moderator
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    Why did you start another thread on the same subject?

    Bad form, dude!


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  4. #3  
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    I can't remember that I've done that
    may be you didn't read the other thread
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  5. #4  
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    Pressure of gas inside the tube in A is the same as atmospheric pressure
    Pressure of gas inside the tube in B is more than the atmospheric pressure

    That's very Okay and very easy to imagine

    but my problem is with C
    I can't imagine why is the pressure of gas inside the tube less than the atmospheric pressure?

    Thanks
    Because the weight of the piston is drawing a vacuum on the gas inside the tube. It is equivalent to withdrawing the plunger on a hypodermic needle and sucking fluid up into the tube.
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  6. #5  
    Forum Ph.D.
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    in case C the Hg will simply drop out and the pressure will be 1 atm. you can't make a solid piston outf Hg
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  7. #6  
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    Yeah.okay thanks
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