What is the principle behind a thermos flask? (2022)

What is the principle behind a thermos flask? (2022)

Step 1: Understand that a thermos flask is designed to keep liquids hot or cold.
Step 2: Learn that heat can move in three ways: conduction, convection, and radiation.
Step 3: Know that insulation is used to reduce heat transfer.
Step 4: Realize that a thermos flask has two walls with a vacuum in between them.
Step 5: Understand that the vacuum prevents heat from moving through conduction and convection.
Step 6: Learn that the reflective coating on the inner wall helps reduce heat transfer by radiation.
Step 7: Conclude that the combination of these features keeps the temperature of the liquid stable.

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