Question

(i) List four factors which affect evaporation.
(ii)Describe the activity to show that water is present in the air.

Answer 1

Ans1.four factors which affect evoporation are
(i) temperature
(ii)surface area
(iii) humidity
(iv)nature of the liquid

Ans2=Take ice cubes in a beaker and kept it open place for some time. You will notice that around the beaker there are some water droplets. This droplets formed are due to condensation of water vaporaround the beaker. This confirmes the presence of water vapour in air.