Porosity 08
Porosity 08 :
In the paper industry, "porosity" is generally measured by the time (in seconds) required for 100 cubic centimeters of air to pass through one square inch of the paper at a standard pressure difference. Thus the porosity unit is square inch seconds per deciliter (s·in2/dl). This is sometimes called a Gurley unit after the name of a test procedure. In SI units, 1 s·in2/dl = 6.4516 seconds per meter column of air (s/m)
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