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An alcohol burner or spirit lamp is a piece of laboratory equipment used to produce an open flame. Alcohol burners are preferred for some uses over Bunsen burners for safety purposes, and in laboratories where natural gas is not available. The flame is generally limited to approximately 5 centimeters (two inches) in height, with a comparatively lower temperature than the gas flame of the Bunsen burner. While these do not produce flames as hot as other types of burners, they are sufficiently hot for performing some chemistries, and standard microbiology laboratory procedures, and can be used for flame sterilization of other laboratory equipment.