Question

energy is taken on We .
regain the energy lost during evaporation. This absorption of energy from the surroundings mans
surroundings cold.
1.6.3. Some examples of cooling caused by evaporation from daily life.
1. Why do we sprinkle water on the roof or open ground in summer ? During the hot summer
evenings, people often sprinkle water on the roof of the house or open ground in front of their house. The
water evaporates by absorbing heat from the ground and the surrounding air. By losing heat, the ground
becomes cool and people feel comfortable.
Similarly, on hot sunny days, water evaporating from the leaves of the trees keeps the surroundings cool.
2. Pouring of acetone on palm. If you pour some acetone (nail polish remover) on your palm, you feel
cool. The reason being that the energy needed for evaporation is taken from the palm. By losing heat, palm
feels cooling
3. Why do we wear cotton clothes in summer ? During summer, we prefer to wear cotton clothes to
keep ourselves cool. The reason being that during summer, we sweat or perspire a lot. Now cotton is a good
absorber of water. Therefore, it absorbs sweat from the body and exposes it to the air (atmosphere). Due to
increase in surface area, sweat evaporates by absorbing heat energy from the body and the cotton clothes
As a result, our body feels cool and comfortable.
On the other hand, synthetic clothes (made up of polyester, nylon, etc.) do not absorb much of swe
and hence fail to cool our body in summer.
4. Perspiration keeps our body cold. On a hot summer day or after doing heavy exercise,
temperature of our body tends to rise. Due to increase in temperature, our body gives out sweat. When
sweat evaporates, it absorbs heat from our body. By losing heat, our body feels cool.
5. Why do we see water droplets on the outer surface of a glass tumbler containing ice-cold wate
nhler. Soon you will notice water droplets on the outer sur​

Answer 1

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