insulation

Everyday

1. Insulation is material that stops heat, cold, sound or electricity from passing through easily. tree →
2. Insulation is the act of covering something with such material. tree →

In the lessons

In science lessons, insulators keep heat in or out: wool, foam, feathers, fur and air are good thermal insulators; plastic and rubber are electrical insulators that cover wires so we do not get shocks. Homes have insulation in lofts and walls to save energy and keep warm. Pupils do tests to see which material keeps ice from melting or water warm longest. Phrases: thermal insulation, sound insulation, loft insulation, wire insulation.

Examples

• Loft insulation keeps the house warm in winter. tree →
• The plastic insulation on the wire stops you getting a shock. tree →
• Penguins have a layer of fat for insulation. tree →
• We tested which material made the best insulation for a cup of hot water. tree →
• Good insulation saves energy and money. tree →
• Never touch a wire if its insulation is broken. tree →

Note

Uncountable. Verb: insulate; a material that insulates is an «insulator»; the opposite is a «conductor». Myth: insulation does not make heat; a coat keeps your own body heat in. Do not confuse with «insulin».