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A bellows is a device that uses air pressure to create a strong flow of air. It consists of a chamber that is filled with air, and two flexible boards that are connected to the sides of the chamber. When the boards are moved apart, the air in the chamber is compressed, and when they are brought together, the air is forced out. This action creates a powerful stream of air that can be used for various purposes, such as blowing dust off of a surface or starting a fire. Bellows have been used for centuries, and they remain an essential tool for many people today.