Skin! The skin of a rhinoceros is 18-20 mm thick. In some parts it is 45 mm.
Skin depth varies quite a bit from individual to individual, but the average for facial skin is 1.3 mm. Eyelid skin is the thinnest on the body and averages 0.05 mm. As a point of reference, the skin of the back is the thickest on the human body and averages 5 mm.
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The PPD skin test for tuberculosis is calculated in MM not percent. Induration of 2 or less than 2 mm, without blistering, is considered a negative skin test.
10 mm = 1cm 1 in = 2.54 cm 1 in = 25.4 mm
90 mm
16.5 mm
304.8 mm
8500 mm
135 mm.