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Hollow hair is a good insulator because of its structure, which traps air within the hollow spaces. This trapped air reduces heat transfer through the hair, providing effective thermal insulation. Here are the main reasons why hollow hair acts as a good insulator:

Air Trapping: The hollow core of the hair traps air, and air is a poor conductor of heat. This trapped air creates a barrier that reduces the rate of heat exchange between the environment and the body.

Reduced Conduction: Solid materials conduct heat more efficiently than gases. By having a hollow structure filled with air, the hair minimizes the amount of solid material through which heat can be conducted.

Lightweight: Hollow hair is lighter than solid hair of the same size, which can be beneficial for animals that need to maintain a balance between insulation and mobility.

Enhanced Insulation Layer: The combination of the hair's material and the trapped air creates an effective layer of insulation, maintaining body temperature by minimizing heat loss in cold environments and heat gain in hot environments.

This insulating property is particularly beneficial for animals living in extreme climates, helping them to conserve energy and maintain a stable internal temperature.

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