In the fiberglass material, the air is trapped in the gap between the solid material.
The thermal conductivity, K of air is way lower than solid material. The trapped air reduces the overall thermal conductivity of the fiberglass and hence it acts as insulating material.
In the fiberglass material, the air is trapped in the gap between the solid material.
The thermal conductivity, K of air is way lower than solid material. The trapped air reduces the overall thermal conductivity of the fiberglass and hence it acts as insulating material.
Source: RetroFoam