Final answer:
Insulation is the material, device, or construction used to restrict the movement of air within open spaces in building components. It reduces heat transfer and is commonly used in walls and ceilings. An example of insulation is fiberglass batt.
Step-by-step explanation:
In the context of building components such as crawl spaces, floor/ceiling assemblies, and roof/ceiling assemblies, the material, device, or construction installed to restrict the movement of air within open spaces is called insulation.
Insulation is used to prevent heat transfer between the inside and outside environment of a building.
It acts as a barrier, reducing the flow of heat through conduction, convection, and radiation.
An example of insulation commonly used in walls and ceilings is the fiberglass batt, which traps air in small spaces and prevents convection.