A Bunsen burner is a common laboratory device used to produce a controlled flame. It consists of a metal tube connected to a gas source, with an adjustable air supply that allows for the regulation of the flame's temperature and intensity. Bunsen burners are primarily used for heating, sterilization, and combustion in scientific experiments. Invented by the German chemist Robert Bunsen in the mid-19th century, this device has become essential in chemistry and biology labs. The flame produced can be adjusted to be either a hot, blue flame for efficient heating or a cooler, yellow flame for safety and visibility.