What would be the best choice for a window to keep the outside heat away?
(A)Single-pane glass.
(B) Double-pane glass without a gap in between.
(C) Double-pane glass with water filled in between.
(D)Double-pane glass with air in between.
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Answer:
d
Explanation:
as the air will work as insulator and won't let the heat come in
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