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Thermal insulation of glass windowsFeatured science projectScience project video


This science fair project was performed to study how different types of glass windows are able to provide indoor thermal insulation. The science project experiment involved single-glazed glass, double-glazed glass and film- coated glass.


Double-glazed glass and film-coated glass provide better thermal insulation compared to single-glazed glass windows.

Scientific Terms

Visible light, ultraviolet light, greenhouse effect, thermal insulation, acoustic insulation


Glass Window and thermal insulation

On hot sunny days, the light and heat coming through the glass window can raise indoor temperatures to very uncomfortable levels. This increase in temperature will neccessitate additional cooling - and higher electricity bills. Air.

The transparency of glass allows both the visible and ultra violet light to pass through it. When the light touches the surface, its energy is absorbed, reflected or scattered as heat. Since glass is a poor conductor of heat, the heat is trapped indoors and the room temperature increases creating a greenhouse effect.

Insulated or double-glazed glass consists of multiple glass panes assembled into a single unit. The gas or vacuum in between the glass panes will provide both thermal and acoustic insulation while still maintaining visual transparency. The use of film-coated or tinted single-glazed glass windows also provides better thermal insulation but the transparency of the glass is compromised.

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Time required:
2 days to prepare, 1 hour for the science project experiment
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