Abstract
When the air in a cylindric bell falling into a water tank passes through a tube of least resistance into the nose and nasopharynx and then out through the mouth opened, the driving pressure at a naris is relatively constant.Consequently a time measured by this apparatus to pass a certain volume of air, (which inversely, of a volume of air per unit of time), is the resistance of a nasal cavity. In this case the proper driving pressure was 2g/cm2.The pressure, however, at the time, when the outlet of the tube was obstructed, had to be a little larger than this value, because the considera- tron of the internal resistance of the apparatus was inevitable.It was, therefore, necessary to correct the time directly measured by this apparatus to that under the driving pressure of 2g/cm2. Auther proposed r.r.(Rhinometric Resistance) as a unit of resistance of nasal cavity ; that is, .a time taken to pass 1 liter of air through a nasal cavity with driving pressure of 2g/cm2.The mean of the resistance of nasal cavity of males, 18 to 38 yrs., who did not show objective nor subjective obstruction, was 3r.r.
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