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What is a common use of Dewar flasks in laboratories?

Heating liquids
Storing gases
Mixing chemicals
Measuring temperatures

Answer

Storing gases is a common use of Dewar flasks in laboratories. These flasks are designed to maintain a constant temperature for extended periods, making them ideal for storing gases that need to be kept at a specific temperature. The double-walled construction of Dewar flasks, with a vacuum between the walls, provides excellent insulation, minimizing heat transfer and maintaining the desired temperature.