A heated bath is used in the laboratory to allow a chemical reaction to occur at an elevated temperature. Heated baths are a type of thermal reservoir and equilibrium system that is able to add heat evenly to a system without changing the temperature of the fluid being used. Heated baths are often used as steps in larger experimental systems including both distillation and incubation. Reactions undergone in a heated bath are typically endothermic due to the continuous supply of heat as opposed to an exothermic reaction.