After I was drinking water in school, I reversed the bottle. At that time, I was wondering how it is possible to form the water droplets on top of bottle. I searched for some information about water's force; Capillary action, Surface Tension. I thought that capillary action is the key to solve this problem. The reason for capillary action is related to polarity, but there is no polarity in plastic.

If I reverse the bottle, some water droplet form on the top of the plastic bottle. The gravity pulls the water droplet, but it still is hanging on.

How it is possible? Is there another force?

After I was drinking water in school, I flipped top-to-bottom the bottle. At that time, I was wondering how it is possible to form the water droplets on top of the bottle; inside the bottle. I searched for some information about water's force; Capillary action, Surface Tension. I thought that capillary action is the key to solve this problem. The reason for capillary action is related to polarity, but there is no polarity in plastic.

If I flipped top-to-bottle the bottle, some water droplet form on the top of the plastic bottle. The gravity pulls the water droplet, but it still is hanging on.

How it is possible? Is there another force?