Q12 of 19 Page 13

How can we smell perfume sitting several metres away from the source?

When perfume is released from the bottle it quickly turns into vapor. Vapor particles have less force of attraction than liquid. That’s why rate of diffusion of gas is very high than liquid. Thus we can get the smell of perfume sitting several metres away from the source.



Fig.9


More from this chapter

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10

Convert the following temperatures to the Celsius scale.

(a) 283k


(b) 570k

 11

Convert the following temperatures to the Kelvin scale.

(a) 27°c


(b) 367°c

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Steam produces more severe burns than boiling water. Think why?

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Fill in the blanks.

a) Temperature does not change while a solid substance is …….. or a liquid substance is…….


b) A vapour on cooling changes into …….and on further cooling changes into……..


c) Matter changes from one state to another either raising the ………… or lowering the …………


d) A change in which a solid on heating directly changes into vapour state is called …………


e) The inter particle spaces are ………… in gaseous and ………… in solids.