Definition of Insul
material used to keep something (usually a building)
Examples of Insulation in a sen
Thick insulation was added to the walls and the attic to keep the cold air out of the old farmhouse. 
Before going skiing again in the snowy Alps, the shivering couple had to add a layer of insulation to warm up their wardrobe. 
During the science experiment, the students tried to decide which insulation material would make the best warm bird’s nest for the robins. 
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