SC-1387
Conduction
Lower Sec Science · Secondary 2 · Medium · Conduction
A vacuum flask has a double glass wall with a vacuum between the walls. Why does the vacuum help to keep hot soup warm for a longer time?
- It prevents heat loss by conduction and convection.
- It increases heat loss by radiation.
- It cools the soup by allowing more air to flow.
- It absorbs heat and becomes a good conductor.
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