Question

Give Reasons:
To clean their spectacles, people often breathe out on glasses to make them wet. Explain why the glasses become wet.
Why do wet clothes placed on a clothesline get dry after some time?

Answer 1

Answer:

1) The glasses become wet because the air we breathe out is warm and contains water vapours which condense on the surface of glass in the form of water droplets. Thus, making the glass surface wet.

2) When the clothes are placed on clothes line get dry after sometime because of the heat produced by the sun . The heat of sun will evaporate the water from the clothes. The process involved in drying up of clothes is called evaporation. Due the sun's heat, the water dries up and rises up into the air.

Answer 2

Answer:1) The glasses become wet because the air we breathe out is warm and contains water vapours which condense on the surface of glass in the form of water droplets. Thus, making the glass surface wet.

Explanation:2) When the clothes are placed on clothes line get dry after sometime because of the heat produced by the sun . The heat of sun will evaporate the water from the clothes. The process involved in drying up of clothes is called evaporation. Due the sun's heat, the water dries up and rises up into the air.