THERMOS FLASK Crossword Clue

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Crossword Puzzle Infos
A thermos flask, also known as a Dewar flask, is a vacuum-insulated container that is used to keep liquids hot or cold for extended periods of time. It was invented by Scottish scientist Sir James Dewar in 1892 and is named after him. The flask consists of two flasks, placed one inside the other and joined at the neck. The gap between the two flasks is partially evacuated of air, creating an insulating vacuum. This vacuum insulation prevents heat transfer by conduction or convection, making it an effective way to keep liquids at their desired temperature.
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