Question

Woolen clothes are good heat insulators because ____ is trapped within the woolen fibres.
A. Air
B. Water
C. Heat
D. Gas

Answer 1

Here first we will learn about what does a good insulator mean then we will move on to understand how wool is a good insulator and what is trapped in it in order to prevent it from getting cool.

Complete answer:
A good insulating fabric can stop or slow the flow of heat. This may include preventing air from entering or working to keep heat from escaping. By their very design, certain fabrics are excellent insulators. Wool and wool blends are usually strong insulators due to the fabric's tight weave and the fact that wool fibres naturally trap air.

Because of the way the fibres serve as a thermal shield, wool is a strong natural insulator. In cold weather, wool can help hold heat in and cool air out. Wool is also odor-resistant, absorbent, and moisture-wicking. Wool is a versatile fabric that can be used for a variety of garments and sewing ventures, including skirts, blankets, coats, historical reproduction clothes, and many others.

All materials are said to have a property called thermal conductivity, which means they can either absorb and pass heat very well or very poorly with their surroundings. This is due to the fact that different materials absorb heat in different ways (as a result of the bonds in their atoms and molecules). The ultimate effect results in different heat conductivity in different materials, and air is excellent at preventing heat transfer. Since thick blankets contain a lot of air, they are warm and comfortable on the inside.

Therefore option A is the correct answer.

Note: Using a material that allows the least amount of heat to escape is what it means to insulate something. The heat conductivity of air is extremely low. Cotton is made up of loosely intertwined fibres that trap a lot of air between them.