Assertion Wool keeps our body warm during winter.Reason Wool contains air trapped between its fibres. (2024)

FAQs

Assertion Wool keeps our body warm during winter.Reason Wool contains air trapped between its fibres.? ›

Hence the assertion given is true and the reason that air is a bad conductor of heat is also true. The given reason is the correct explanation of the assertion. Hence, the correct answer is option C. Note: Woolen

Wool is a bad conductor of heat. It traps air between its fibres. This trapped air does not allow heat to pass from our body into the surrounding thereby keeping us warm. Hence, we should wear woollen clothes in winter.

Merino wool is one of the rare fabrics that can generate heat while it dries. When a wool garment gets wet, water is adsorbed, meaning it gets trapped in wool's porous fibers. Inside the fibers, the hydrogen bonds in water break down. This creates a chemical reaction that generates heat.

Air trapped by the woolen fabric help us during winter. As air is bad conductor of heat and doesn't allow body heat to escape into atmosphere. The heat stored inside the body does not goes out as wool and air acts as a layer of insulator.

The wool yielding animals like sheep, goats, yak, etc., have thick hair on their body. Hair traps a lot of air. Air is a poor conductor of heat, which does not allow the heat absorbed to release from their body and keeps them warm.

Wool absorbs moisture from the atmosphere of greater humidity to create a drier environment as a way of maintaining balance. This means in the winter wool helps to hold in your body heat, while in the summer wool helps your body cool off.

Wool as an Insulator

Each wool fiber is composed of protein molecules (keratin) organized into five follicles. These fibers effectively trap air, moisture and harmful chemicals. Using wool as insulation actually helps keep your home warm in the winter and cool in the summer, while improving indoor air quality.

INSULATION PROPERTIES

Mineral wool has low thermal conductivity, meaning it has the ability to restrict the flow of heat. Its dense fibre structure and the presence of air pockets within the material make it an efficient thermal insulator.

Woolen clothes have the ability to prevent the loss of heat from our body into the surroundings. This is because woolen clothes have a large amount of air molecules trapped inside. The presence of these large amounts of air molecules will make it an insulator to heat. We know that air is a bad conductor of heat.

The woolen fabric is a bad conductor of heat and traps a air layer. This air allows passage of warmer air from body to atmosphere. The woolen fabric is an insulator of heat and traps a layer of air in its fabric layer. Air being an insulator doesn't allow body heat to escape into atmosphere.

How woolen sweaters keep us warm by trapping layer of air? ›

Complete answer:

Woollen fabrics basically trap air between them and air is a poor conductor of heat. So the heat which is radiated from the body also gets trapped due to the air between the woollen fabrics which doesn't allow it to transfer the heat in the surrounding.

How does wool clean the air? Research by AgResearch scientists has revealed wool carpets significantly improve indoor air quality by rapidly absorbing the common pollutants formaldehyde, sulphur dioxide and nitrogen oxides.

Instead of washing, air out your woollen garments from time to time to remove any unwanted odours by either laying them flat on a bed or hanging it on a hanger for an hour or so.

Wool contains a lot of air trapped between its fibres. This trapped air does not allow heat to pass from our body into the surroundings. Hence, we prefer to wear woollen clothes in winter.

Quite incredibly, wool can absorb 30% of its weight in water without feeling wet at all; and what happens next is astounding. In cold weather, during this process of trapping the moisture, wool actually generates heat.

The structure of wool makes it an effective insulator. Made of the protein keratin, also found in human hair, each wool fiber has natural kinks. These bends trap in dry air to keep your body warm. Instead of pulling and absorbing the heat away from your body, wool keeps this heat close to your skin.

During winter, wool truly shines as a natural insulator. Its crimped and curly fibres create countless tiny air pockets within the fabric, reducing heat conduction between our bodies and the cold air outside.

Unlike wool, which will wick away moisture and dry quickly, cotton becomes saggy and clammy and soaked, potentially amounting to a liability on a cold day (that extra moisture will sink your body temperature in minutes, sapping you of the energy and the ability to navigate demanding backcountry scenarios with ...

Wool adsorbs water. Once inside the fiber, there is a temporary chemical bond (hydrogen bond) attaching water molecules to the surfaces of inner structures of the fiber. All adsorbtion is exothermic, meaning that it releases heat. Breaking the hydrogen bond and freeing the water molecule, desorption, requires heat.

When it comes to keeping you warm as a throw or blanket, wool takes the lead over fleece. The insulation value of wool is higher, meaning it has superior insulating power compared to fleece. Even when wet, wool can still retain heat, making it an excellent choice for cold weather conditions.