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Table 5 Values of the bearing area curve for two pipette tips having different sizes.

From: Surface properties of glass micropipettes and their effect on biological studies

Name Value (D t = 34.5 μm) Value (D t = 3.9 μm) Description
S k 412.7 nm 85.5 nm Core roughness depth, Height of the core material
S pk 266.3 nm 42.6 nm Reduced peak height, mean height of the peaks above the core material
S vk 320.1 nm 66.3 nm Reduced valley height, mean depth of the valleys below the core material
S mr1 10.91% 8.16% Peak material component, the fraction of the surface which consists of peaks above the core material
S mr2 89.08% 84.98% Peak material component, the fraction of the surface which will carry the load
V mp 0.013 ml/m2 0.002 ml/m2 Peak material volume of the topographic surface (ml/m2)
V mc 0.146 ml/m2 0.033 ml/m2 Core material volume of the topographic surface (ml/m2)
V vc 0.204 ml/m2 0.039 ml/m2 Core void volume of the surface (ml/m2)
V vv 0.028 ml/m2 0.006 ml/m2 Valley void volume of the surface (ml/m2)
V vc/V mc 1.410 1.174 Ratio of V vc parameter to V mc parameter