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What is the main component of a vacuum flask?

Glass
Vacuum
Plastic
Metal

Answer

Vacuum is the primary component of a vacuum flask, which is designed to maintain the temperature of its contents. The vacuum creates an insulating layer between the inner and outer walls of the flask, minimizing heat transfer through conduction and convection. This effectively prevents heat from escaping or entering the flask, allowing it to keep hot liquids hot and cold liquids cold for extended periods.