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From the book : as the shear rate is constant in a cone-and-plate instrument, the geometry is ideal for measuring normal stress differences.  
ÐýתÁ÷±äÒÇÉÏ¿ÉÒԵõ½ normal force (F), Ö®ºó¿ÉÒÔʹÓù«Ê½ N1=2F/(PI*R^2).
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