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Chemistry LibreTexts

A Capillary Flow Analogy

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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