IDNLearn.com: Where your questions are met with thoughtful and precise answers. Our platform provides prompt, accurate answers from experts ready to assist you with any question you may have.

In surface chemistry, what does the contact angle measure?
a) The thickness of a liquid film on a surface
b) The rate of evaporation of a liquid
c) The angle formed between the tangent to the liquid surface and the solid surface at the point of contact
d) The density of a liquid on a surface