A water bath is a laboratory equipment used to maintain a stable temperature for various experiments or processes. It consists of a container filled with water, where samples can be placed in smaller containers to ensure even heating or cooling. This method is often used in chemistry and biology for tasks like incubating cultures or melting substances. Water baths can be set to specific temperatures, allowing for precise control during experiments. They are commonly used in conjunction with other equipment, such as thermometers and heating elements, to monitor and adjust conditions as needed.