Final answer:
Fiberglass is a material made from spun glass filaments used for insulation because it traps air pockets, providing effective thermal resistance. It's used in buildings and various composite materials.
Step-by-step explanation:
Glass that has been spun into fine filaments and is used for insulation is known as fiberglass. This material is an effective insulator because it traps many small pockets of air within its structure, which take advantage of air's poor thermal conductivity. Fiberglass is commonly used in the insulation of walls and ceilings (Figure 1.23) to prevent heat transfer between the inside of a building and the external environment. It is part of a category of materials including polystyrene, mineral wool, and goose-down feathers that are all recognized for their insulation properties due to their ability to hold air still, reducing heat loss.
Fiberglass is not only used in the construction industry for insulation (Figure 10.5.6) but is also utilized in various applications, such as in the manufacturing of glass-reinforced plastics found in boats, fishing rods, and certain types of cookware.