a)
What are the two important physical quantities that characterize
wetting and liquid repellency of a
solid surface? Name them, and explain the difference between
these two quantities
b)
Peter is playing around with four different solid surfaces
(labelled as A, B, C, and D) by placing
different types of liquids onto these surfaces. Peter found
something very puzzling: When he
placed small drops of water and oils onto Surface
A, all of these liquids stick to the surfaces.
However,...