Rest your wrist to give it time to heal. You may find that, depending on the severity of the sprain, immobilization through a soft cast is necessary. If your sprain is the result of a sports injury, you should stop playing the sport immediately, at least for a few weeks while your wrist heals.
Water also has a high level of surface tension. This means that the molecules on the surface of the water are not surrounded by similar molecules on all sides, so they're being pulled only by cohesion from other molecules deep inside. These molecules cohere to each other strongly but adhere to the other medium weakly.
This latter case also applies to the case of a bubble surrounded by a liquid, such as the case of the alveoli of the lungs. Surface tension is responsible for the shape of liquid droplets. Although easily deformed, droplets of water tend to be pulled into a spherical shape by the cohesive forces of the surface layer. The spherical shape minimizes then necessary wall tension of the surface layer according to LaPlace's law.