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Chemistry LibreTexts

A Capillary Flow Analogy

[ "article:topic", "Fundamental" ]
  • Page ID
    2964
  • Chemical Concepts Demonstrated

    Demonstration

    Capillary tubing is attached a buret filled with water and clamped in a horizontal position.

    Use a stop watch and record time vs. volume measurements as the water flows out of the buret. 
     

    Observations

    Plotting volume versus time yields a slightly curved line.  Plotting the log of the volume versus the time yields a straight line.


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    Explanation

    Because the log of the volume versus the time yields a straight line when plotted, the capillary flow appears to be first-order.

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