A bain-marie ( pronounced : ( bɛ̃ maʁi ) ; also known as a water bath or double boiler in English ) is a piece of equipment used in science , industry , and cooking to heat materials gently and gradually to fixed temperatures , or to keep materials warm over a period of time .
A bain-marie ( or water bath ) is a piece of equipment used in science , industry , and cooking to heat materials gently and gradually to fixed temperatures , or to keep materials warm over a period of time .