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What feature of double-glazed windows makes them good insulators? a. Thick glass is highly viscous. c. Heat conduction cannot take place through solid glass b. There is a vacuum between the panes of glass d. Thermal energy is not transferred through the special chemical glazing.

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roger48118
none  of the above.
The air gap between the panes adds some thermal   insulation.
About 1/2"  is best.  Less than that  you  get     conduction.  More than that you get more convection between panes.   Double glazed windows do not usually have a vacuum in them --   there could be argon  tho...