
Insulator
Types of Insulators
Insulators can be classified by what they resist such as heat, electricity, or sound.

Glass wool is a popular thermal insulator in buildings.
Insulator Materials
Common insulating materials include rubber, plastic, glass, and wood.

The plastic coating on wires acts as an electrical insulator.
Insulation Effectiveness
The effectiveness of an insulator is measured by its ability to resist the transfer of a particular form of energy.

A double glazed window is a more effective sound insulator than a single pane.
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