SC-1367
Conduction
Lower Sec Science · Secondary 2 · Medium · Conduction
In a thermos flask, the space between the double walls is a vacuum instead of air. Compared to trapped air, why does a vacuum reduce heat transfer even more?
- A vacuum has no particles, so conduction and convection cannot occur.
- A vacuum has more particles, so conduction is faster.
- A vacuum completely stops heat radiation.
- A vacuum allows more air to circulate, increasing convection.
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