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Answer :
Final answer:
The vacuum in a thermos flask prevents heat transfer through conduction, convection, and radiation. This design helps maintain the temperature of the contents, whether hot or cold. Therefore, the correct answer is option D.
Explanation:
Purpose of Vacuum in a Thermos Flask
A thermos flask is designed to maintain the temperature of its contents, whether hot or cold. The vacuum within the thermos serves a crucial role in this process.
The primary purpose of the vacuum is to prevent heat transfer through conduction, convection, and radiation.
Heat Transfer Mechanisms
- Conduction: This is the transfer of heat through direct contact. In a thermos, since the vacuum has no matter, there are no particles to transfer heat between the inner and outer walls.
- Convection: This involves the movement of fluids (liquids or gases) that carry heat. With a vacuum, there are no air or liquid particles to move and transfer heat.
- Radiation: This is the emission of energy as electromagnetic waves. Traditional thermos flasks often have reflective materials that minimize heat loss by radiation, in addition to the vacuum.
Therefore, the correct option regarding what the vacuum prevents would be D: conduction, convection, and radiation. This ensures that the contents of the thermos maintain their temperature for extended periods.
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