Question

How many protons are contained in a circular puddle of mercury that is 8.5 inches wide and .25 inches deep?
What's the size of the protons? You can look up the diameter and the area of a sphere (if you assume they are spheres) is (4/3)*pi*4^3. Do you want the Hg in cubic inches or cubic centimeters. If cc, then
8.5 in x (2.54 cm/in) = ? cm
Area of Hg is pi*r^2
thickness is 0.25 in and that is
0.25 in x (2.54 cm/in) = ?

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