Q60 of 160 Page 37

(a) What is evaporation? State the various factors which affect evaporation.

(d) Why does evaporation cool a liquid?

(a) The process of a liquid changing into vapour (or gas) even its boiling point is called evaporation.


Factors affecting Evaporation:


1). Temperature


2). Surface area


3). Humidity


4). Wind speed


(c) The cooling caused by evaporation is based on the fact that when a liquid evaporates, it takes the latent heat of vaporization from surroundings which it touches. By losing heat, the surroundings get cooled.

More from this chapter

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58

(a) What is sublimation? Name two substances (other than ammonium chloride) which undergo sublimation.

(b) Draw a labeled diagram of the experimental set-up to demonstrate the sublimation of ammonium chloride.

 59

(a) What are the two ways in which the physical states of matter can be changed?

(b) Draw the ‘states of matter triangle’ to show the interconversion of states of matter.


(c) How can the evaporation of a liquid be made faster?

 61

Which of the following are also considered to be the states of matter?

(i) Plasma (ii) Platelets


(iii) BFC (iv) BHC

 62

One of the following does not undergo sublimation. This one is: