PH-2157
Thermal radiation
Physics · Secondary 4 · Medium · Thermal radiation
A vacuum flask is used to keep water hot. The space between the double glass walls is a vacuum and the inner surfaces of the glass are silvered. What is the main purpose of silvering these surfaces?
- To improve conduction of heat through the glass walls.
- To reduce heat transfer by radiation across the vacuum.
- To allow convection currents to form in the vacuum space.
- To increase absorption of heat from the surroundings.
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