Question

would the tight packing of more insulation, such as glass wool, in an enclosed space increase or decrease the insulation value?
multiple choice
increase, because more of the material is in contact
decrease, because the density of the material is increased
increase, because you have more insulating material
decrease, because there are fewer air spaces

Explanation:

Insulation materials like glass wool rely on air pockets (air is a poor conductor of heat) for their insulating properties. When tightly packed, the number of air spaces decreases. Heat transfer (conduction) is more efficient in denser materials (less air - pockets). So, the insulation value decreases.

Answer:

decrease, because there are fewer air spaces