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Blacksmiths work iron when it is hot enough to emit plainly visible thermal radiation.
Blacksmiths work iron when it is hot enough to emit plainly visible thermal radiation.
Solar water heating system based on evacuated glass tube collectors. Sunlight is absorbed inside each tube by a selective surface. The surface absorbs
Solar water heating system based on evacuated glass tube collectors. Sunlight is absorbed inside each tube by a selective surface. The surface absorbs sunlight nearly completely, but has a low thermal emissivity so that it loses very little heat. Ordinary black surfaces also absorb sunlight efficiently, but they emit thermal radiation copiously.
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Thermal radiation in visible light can be seen on this hot metalwork. Its emission in the infrared is invisible to the human eye. Infrared cameras are
Thermal radiation in visible light can be seen on this hot metalwork. Its emission in the infrared is invisible to the human eye. Infrared cameras are capable of capturing this infrared emission (see Thermography).
Radiant heat panel for testing precisely quantified energy exposures at National Research Council, near Ottawa, Ontario, Canada
Radiant heat panel for testing precisely quantified energy exposures at National Research Council, near Ottawa, Ontario, Canada
Image: Human Infrared
Image: Human Infrared
Image: Human Visible
Image: Human Visible