10-1.Thermometry, Thermal Expansion and Calorimetry
medium

$12°C$ તાપમાને જ્યારે પાણીની વરાળનું આંશિક દબાણ $0.012 \times {10^5}\,Pa$ હોય ત્યારે હવાની સાપેક્ષ આદ્રતા (ભેજ-Humidity) ......... $\%$ હશે? ( આ તાપમાને પાણીની વરાળનું દબાણ $0.016 \times {10^5}\,Pa$ છે)

A

$70$

B

$40$

C

$75$

D

$25$

(AIIMS-1998)

Solution

(c) Partial pressure of water vapour ${P_W} = 0.012 \times {10^5}\,Pa$,

Vapour pressure of water ${P_V} = 0.016 \times {10^5}\,Pa$.

The relative humidity at a given temperature is given by $ = \frac{{{\rm{Partial\,\,pressure \,\,of\,\, water\,\, vapour}}}}{{{\rm{Vapour\,\, pressure\,\, of\,\, water}}}}$

$ = \frac{{0.012 \times {{10}^5}}}{{0.016 \times {{10}^5}}} = 0.75 = 75\% $

Standard 11
Physics

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