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A quandry

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Mike T., Swampeast MO
Mike T., Swampeast MO Member Posts: 6,928
in THE MAIN WALL
IR "heat measuring gun" manufacturers claim that glass is "completely opaque to IR".

Infrared is "radiation in the form of heat".

How can I feel (and even be made uncomfortable by) the sun shining through glass?

Is it just that glass is "completely opaque to IR" IN THE RANGE USED by such measuring devices?

This "thing" of trying to understand radiator placement as related to windows grows REALLY interesting...

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  • Mark J Strawcutter
    Mark J Strawcutter Member Posts: 625
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    is there a difference

    between IR passing thru the glass and IR heating the glass which in turn re-radiates [a possibly different wavelength] into the room which is what you feel?

    Mark
  • Mike T., Swampeast MO
    Mike T., Swampeast MO Member Posts: 6,928
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    THANK YOU MARK!!

    Sometimes the obvious is the easiest to forget...

    Even when really cold, the sun can heat the glass considerably and the glass in turn heats you via its high emissivity. The heat didn't pass through, it was received and transmitted just as with every other object.

    The fact that visible light passes through has no relevance...

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