Everything infrared thermography including discussions on thermal imaging equipment, the applications, limitations of the technology, educational tips & videos and much more!
Very nice demonstration ! Do I understand that the ability to absorb heat and the ability to emit it are basically the same physical property? If your two cans full of liquid started at room temp, and you put them in the refrigerator, will the taped one also get cold faster?It's particularly interesting, because aluminum is such a good thermal conductor. How might you demonstrate this completely counter-intuitive difference between aluminum's high conductivity and its low emissivity ? What a great teaching tool !!
The ability to absorb thermal radiation and emit it are equal at the same IR wavelength. This is called Kirchoff's Law. So yes, the taped can would cool faster in the refrigerator.In any heat transfer situation, one must think about all the heat tranfer mechanisms going on: conduction, convection, and radiation. Just because aluminum is a great conductor of heat, doesn't necessarily mean that it will always heat or cool the fastest.
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