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Viscosity comparison method

  1. Sep 15, 2012 #1
    Hi,I don know if my question will be clear,but I will try it.So,I m wondering how was derive this equation:
    viscosity=viscosity(known liquid)*density(known from table)*time(liquid will get over one point of Ubelohde viscometer to second point of viscometer(unknown liquid)/density(known liquid)*time(liquid will get over one point of Ubelohde viscometer to second point of viscometer(unknown liquid).
    So once again in short form:viscosity*density*time/density*time.
    So,I know it is a comparison method,that means density*time/density* time is undimensional and that means,that viscosity=density*time in this case.
    And now my question:Why density in this equation?Why not only weight?Or why not to neglect density and count only time?Why is density neccessary here?
    Thanks for patient and widespread answer.
     
  2. jcsd
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