Miles Heated
If heat from the sun travels millions of miles through the vacuum of space, why does the vac between 2 panes..
of glass stop 95% of the heat? And how does it work even with no coloring or mirroring embedded in the glass?
Thanks!
Dear Someone, this has a relatively easy answer. Sunlight or more properly, short wave solar radiation, peaks in the visible portion of the E-M spectrum. In this vacuum of space there is nothing which converts the energy to long-wave heat energy, or more properly, infrared energy. The vacuum between two panes of glass will not prohibit the transmission of short wave radiation. However, the long wave IR from inside the home will be reflected back into the room just as it is in a greenhouse as it is unable to be transmitted through the glass. When the inside pane of glass is warmed by conduction from the inside, it will transmit IR through the vaccum towards the opposite pane of glass. Since the space between the two is a vacuum, the space does not warm and the wavelength of the radiation remains the same and simply is reflected back and forth within the vacuum.
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