Question

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9. Give reason for the following questions:
(a) Wet clothes dry quicker in sun than in shade.
(b)We feel uncomfortable when the humidity is high.
(c) Trees acquire more leaves in summer.
(d)We should wear cotton clothes in summers.
10. Name two gases that are supplied in compressed state in homes and in hospitals.
11. Is evaporation an exothermic or endothermic process? Explain.
12. Why do liquids flow? Explain.​

Answer 1

Answer:

The heat of sun causes evaporation of water from the wet clothes more rapidly than the evaporation in shade. Due to this; wet clothes dry up quickly in sun than in shade

2.Humidity is uncomfortable because it holds moisture to our bodies, not allowing us to cool. ... Normally, this wet (and stinky) process is the body's way of cooling itself off, but when high humidity turns that heat sticky, you can start to feel uncomfortable because the sweat has nowhere to go

3.We sweat more in the summer session. Cotton is a strong water absorber helps to absorb the sweat and introduce to the environment of evaporation. Our body takes out heat as the sweat evaporates from our body.

4.During summer the temperature is generally very high. In order to keep cool, a tree must transpire (transpiration is a phenomenon of evaporation of water from the leaves) more to keep itself cool. ... Hence, a tree acquires more leaves during summer

5.We sweat more in the summer session. Cotton is a strong water absorber helps to absorb the sweat and introduce to the environment of evaporation. Our body takes out heat as the sweat evaporates from our body

6.lpg and oxygen are two gases which are supplied in compressed form in homes and hospitals

7.Evaporation is an endothermic reaction because the liquid molecules must absorb heat in order to transform into gas molecules

8.The forces between liquid particles are weaker than the forces between solid particles. This means that liquid particles are further apart and can move about more easily. Since the particles can move, the liquid can flow and take the shape of its container

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