Radiant Heat Energy: Why is Hand Protected Behind Glass?

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westdivo
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why does your hand not feel the radiant heat energy from a fireplace if you place it behind a sheet of glass, even though you can see the fire very easily?
 
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I've never noticed that. Do you know the greenhouse effect?
 
Really? I doubt it.
Why can my hand feel the radiant heat from the sun if we place it under glass?

And what is the relation between the question and the greenhouse effect?
 
zlbeidou said:
what is the relation between the question and the greenhouse effect?

If you have a barrier (glass or atmosphere) that is opaque to infrared but transparent to visible light, it will let plenty of energy in during the day, and still block much of the heat-loss during the night. (The key is the differences between the radiation spectra from either side.)
 
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