why is it that heat penetrating glass is a one way thing? Is in a greenhouse, heat will penetrate the glass and get trapped inside the greenhouse.
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The heat you feel when standing out in the sun is mostly from electromagnetic radiation from infrared light. This is why, on hot days, it can be significantly cooler when you are in the shade. Infrared light is really good at passing through glass. The infrared is then absorbed by objects within the greenhouse, which in turn emits the energy back out as heat through convection into the air in the greenhouse. Once the heat energy is in the air, the greenhouse’s insulation traps that air inside of it.
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