Solar Oven
Why does the heat in a solar oven not escape through the glass?
Is it because it when the sunlight enters it has a shorter wave length than the wave length of heat?
Also if you can compare the wave lengths of light and heat.
In fact, some heat does leave through the glass, just not as much as could be lost by convection (the hot air escaping from the oven). That's why there is likely a fairly airtight seal on the oven, at least near the top.
You will also usually see insulation surrounding the oven, to minimize heat loss by conduction.
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