Encceja Ensino Médio Practice Questions - Exame Nacional Para Certificação De Competências De Jovens E Adultos - Ensino Médio Exam

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A thermal flask (garrafa térmica) is engineered to keep hot liquids warm and cold liquids chilled for extended periods by minimizing the three physical mechanisms of heat transfer: conduction, convection, and radiation. Which specific design feature of the thermal flask is primarily responsible for preventing heat transfer by radiation?

The internal mirrored (silvered) double glass walls, which reflect thermal infrared waves back into the liquid The tight rubber or plastic stopper at the top, which blocks fluid circulation The partial vacuum between the double glass walls, which eliminates molecular collisions The rigid protective outer plastic casing, which provides structural impact resistance

Correct Answer:

The internal mirrored (silvered) double glass walls, which reflect thermal infrared waves back into the liquid

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