A Bunsen burner is a common laboratory instrument that produces a single open gas flame. It is named after its inventor, Robert Bunsen. The burner is composed of a vertical metal tube that is connected to a gas source, usually through a flexible hose.

At the base of the tube, there is a small, adjustable opening through which the gas flows into the burner. The gas is mixed with air in the tube, creating a blue flame that is used for heating, sterilization, and combustion.

The height and intensity of the flame can be adjusted by controlling the amount of gas and air flowing into the burner. The Bunsen burner is a crucial tool in chemistry and biology labs, where it is used for a variety of applications, including heating solutions and samples, sterilizing equipment, and performing chemical reactions.