NCERT Solutions for Class 7 Science Chapter 4
Important NCERT Questions
7th Chapter 4 Heat
NCERT Books for Session 2022-2023
CBSE Board and State Board
Questions No: 5
Discuss why wearing more layers of clothing during winter keeps us warmer than wearing just one thick piece of clothing.
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The air gets trapped between two layers of warm clothes. Air acts as insulator of heat. This layer prevents our body heat to escape in the surroundings. More layers of thin clothes will allow more air to get trapped and as a result we will not feel cold. So wearing more layers of clothing during winter keeps us warmer than wearing just one thick piece of clothing.
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Wearing multiple layers of clothing in winter offers superior warmth compared to wearing a single thick garment. Here’s why layering is more effective:
Air Trapping:
1. Insulating Air Pockets: Each layer traps air between them. Air acts as a poor heat conductor, forming insulation that reduces heat loss to the cold environment. These air pockets create a barrier, slowing down heat transfer from the body.
2. Enhanced Heat Retention: Multiple layers create a thermal barrier, improving the body’s ability to retain heat. The more layers, the more air pockets are formed, enhancing insulation.
3. Temperature Regulation: Layering allows for better temperature control. Layers can be adjusted based on changing weather conditions or activity levels. Adding or removing layers helps manage body temperature effectively.
4. Moisture Control: Layering with moisture-wicking fabrics helps manage sweat. Inner layers made of such materials draw moisture away from the skin, keeping it dry and preventing discomfort caused by dampness.
Single Thick Clothing:
– A single thick garment might not create as effective insulation as multiple layers. Additionally, it lacks the flexibility to adapt to temperature changes or varying activities.
In summary, layering creates insulating air pockets, provides better flexibility in temperature regulation, and manages moisture more efficiently compared to wearing a single, thick garment, ensuring enhanced warmth and comfort in cold conditions.