6

Surface Tension and Contact Angle

Application to Pure Substances

I don’t think I said anything about the Third Dimension; and I am sure I did not say one word about “Upward, not Northward,” for that would be nonsense, you know. How could a thing move Upward, and not Northward? Upward and not Northward! … How silly it is!

From Abbott’s Flatland

6.1  INTRODUCTION

6.1a  What Are Surface Tension and Contact Angle?

Why is it that insects like beetles can walk on water? Why do the bristles of a brush immersed in water cling together as the brush is pulled out? Phenomena such as these arise because of a special property of interfaces that separate two phases. Let us consider another example first. Everyone has had the experience of pouring more beverage ...

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