Figure 1.1: A water droplet with a radius of 1 mm resting on a glass substrate. The surface of the droplet takes on a spherical cap shape. The contact angle θ is defined by the balance of the interfacial forces.

Figure 1.1: A water droplet with a radius of 1 mm resting on a glass substrate.
The surface of the droplet takes on a spherical cap shape. The contact
angle θ is defined by the balance of the interfacial forces.