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Homework Help: Volume of air in a treachea Help please

  1. Oct 7, 2012 #1
    1. The problem statement, all variables and given/known data
    Reynolds number and the turbulence of trachael air flow

    under the conditions of normal activity an adult inhales about 1.1l of air during each inhalation. using a stop watch, dTErmine the time for one of your own inhalations and hence estimate the volume flow in m^3/s through your trachea during inhalation. The diameter of the trachea is appx 25mm.

    2. Relevant equations

    3. The attempt at a solution

    I converted 25mm to m = 0.025m
    1.1l = 0.001 meters^3
    I just cant seem to get the right "inahlation using a stopwatch". I used 0.3m^3/s but that didnt seem to be right at all. Can anyone help me? What is a reasonable vallue for this??
  2. jcsd
  3. Oct 7, 2012 #2


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    What did you get for your inhalation time? If you don't have an actual stopwatch, a clock or watch that displays the seconds (in addition to hours and minutes), or one that has a seconds hand, would work.
  4. Oct 7, 2012 #3
    2.5 seconds per inahalation
  5. Oct 7, 2012 #4
    If each inhalation contains 1.1 liters (1100cc) and requires 2.5 seconds, what is your inhalation rate in lites/sec (or cubic meters per second or cc/sec)?
  6. Oct 8, 2012 #5


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    Okay, that sounds totally reasonable. Now you just need to follow Chestermiller's line of questions. You have the amount of air in liters, and the amount of time in seconds. So next you need to calculate the rate in liters/second.
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