Request a call back

Join NOW to get access to exclusive study material for best results

CBSE Class 9 Answered

Give reasons for the following: (i)After rain, wet roads dry up quickly. (ii)In summers, we feel cool and comfortable while seating under a fan. (iii)Doctors advise to put strips of wet cloth on the forehead of a person having high temperature. (2 Marks each)  
Asked by Topperlearning User | 05 Apr, 2016, 12:28: PM
answered-by-expert Expert Answer

(i) After rain, wet roads dry up quickly because the rain water is spread over a large area of road. This increases the rate of evaporation since the particles are now scattered over a large surface area.

(ii) We feel cool and comfortable while seating under a fan because a fan increases the rate of evaporation of sweat from our skin.

(iii)Water while evaporating takes away the necessary latent heat of vaporisation from the body of the patient and thus lowers the temperature of his body.

Answered by | 05 Apr, 2016, 02:28: PM
CBSE 9 - Chemistry
Asked by meghnahire17.9 | 17 Jul, 2022, 05:41: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Chemistry
Asked by rajuvrajuraju3 | 17 Jul, 2022, 11:05: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Chemistry
Asked by kalpanatiwaritiwari7030 | 24 Oct, 2021, 12:20: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Chemistry
Asked by ushadevihld02 | 07 Jul, 2021, 08:21: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Chemistry
Asked by vipulvspecial | 26 May, 2021, 09:45: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Chemistry
Asked by swatipuspapatel | 15 Jun, 2020, 08:56: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Chemistry
Asked by pranita.krmis | 06 Jun, 2020, 05:32: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Chemistry
Asked by o.nisha.singh.2020 | 13 May, 2020, 10:59: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Chemistry
Asked by achutkottawar | 13 May, 2020, 01:55: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Chemistry
Asked by anithar7699 | 02 May, 2020, 10:00: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
Get Latest Study Material for Academic year 24-25 Click here
×