To: Harmless Teddy Bear
"The air gap is what keeps the heat or cold out. " The gap is a vacuum which does not allow conduction of heat or cold.
16 posted on
10/08/2018 1:54:15 PM PDT by
blam
To: blam
The gap is usually air, argon, or krypton. Building them to hold a vacuum would be too expensive - think of the pressure on the glass.
17 posted on
10/08/2018 1:59:44 PM PDT by
Pollster1
("Governments derive their just powers from the consent of the governed")
To: blam
Yes. I thought that was what I said.
18 posted on
10/08/2018 2:04:30 PM PDT by
Harmless Teddy Bear
(Somewhere there's danger, somewhere there's injustice, and somewhere else the tea is getting cold.)
To: blam
Not accurate re. the gap being under vacuum. The gap is filled with air or argon with argon being better. The gap is sealed though so the pressure will fluctuate some depending on temperature. The function of the gap is to reduce heat conduction through the window, which is much greater for a single pane windows.
Under vacuum generally means pumped to a very low pressure via a vacuum pump. While it's certainly possible for a negative pressure to be present because of temperature change, this is kind of trivial in terms of contributing to energy efficiency +/- in a modern window.
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