Why Does Water Roll Off Your Skin After Swimming?

The surface tension of water is caused by the cohesive forces between water molecules. These forces form a barrier that resists the penetration of other materials. When a person gets out of a swimming pool, the water on their skin is held in place by surface tension. However, when they move, the water can no longer resist the force of gravity, and it rolls off their skin.

In addition to surface tension, the air flowing around a person's body can also help to pull the water off their skin. This is called the wind chill effect. When the air is moving quickly, it can create a negative pressure on the surface of the skin, which pulls the water off.

Finally, the temperature of the water can also affect how quickly it rolls off a person's skin. Warm water has a lower surface tension than cold water, so it will roll off more easily.