Bubble

Sure, here is the definition of the word “bubble”:

bubble:A small, spherical mass of air, often enclosed by a thin layer of soapy water.

A bubble is a small, concave surface of air enclosed by a thin film of soapy water. It is formed when air is blown into a soapy solution. The surface of the bubble is created by the surface tension of the water. The air inside the bubble is trapped by the surface tension.

Bubbles can be blown on a feather, or they can be attached to a string. They are often used in games and decorations.