33. The metric prefixes (micro (µ), pico, nano, …) are given for ready reference on the inside front cover of the textbook (see also Table 1–2). The surface area Aof each grain of sand of radius r= 50 m = 50 ×10−6m is given by A= 4π(50×10−6)2= 3.14 ×10−8m2(Appendix E contains a variety of geometry formulas). We introduce the notion of density, /mVρ=, so that the mass can be found from m= V, where = 2600 kg/m3.Thus, using V= 4r3/3, the mass of each grain is ()36
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SI prefix, Kilogram, indicated surface area