Definition: Thermos means a heat source that provides heating or warming for space, particularly in a vessel to facilitate cooking. Thermos refers to the process of converting hot water into steam and then transferring it from one vessel to another so as to provide heating or warmth. Definition of "Thermos": 1) A heat source that converts hot water into steam and transfers it between vessels or containers so as to provide heating or warmth to a space, particularly in a vessel to facilitate cooking. 2) The process by which the temperature of a container is increased by heating or warming its contents with a heat source. This involves either adding water or a heat source that increases the volume of the container, causing it to expand and then rise above the base of the container. 3) The use of a high-pressure steam generator (Thermos) for food preservation, as it can be used to increase the temperature and pressure at which a liquid is cooked, making it more tender and less expensive to store.
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