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regarding measurements

Posted by unclestu on April 21, 2010 at 14:33:18:
In the world of smells, the best "noses" can detect what amounts to a few parts per trillion, as determined by spectrographic analysis of a cubic volume of air. Usually human perception of scents is considered one of the weakest of the human senses. What would parts per trillion translate in terms of sound to such things as distortion, etc.?

So now, we come to that "slight" difference in measurement. I doubt if that magazine uses something like the best Rhode and Swartz test units. Their real time analyzer costs over 6 digits and there are maybe 6 to 8 units in existence worldwide ( US bureau of standards, NASA, and the military have one apiece). So in terms of the parts per trillion that a human, a bit skilled, nose can detect,l what equivalent is that "slight" difference. Accuracy to 6 decimal places is only to the millionth degree.

Stu