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Kinetic Theory of Gases — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysicsKinetic Theory of Gases2 Marks
Question
A glass contains some water at room temperature 20°C. Refrigerated water is added to it slowly. When the temperature of the glass reaches 10°C, small droplets condense on the outer surface. Calculate the relative humidity in the room. The boiling point of water at a pressure of 17.5mm of mercury is 20°C and at 8.9mm of mercury it is 10°c.
✓

Answer

Given, SVP at the dew point = 8.9mm SVP at room temp = 17.5mm Dew point = 10°C as at this temp. the condensation starts Room temp = 20°C$\text{RH}=\frac{\text{SVP at dew point}}{\text{SVP at room temp}}=\frac{8.9}{17.5}=0.508\approx51\%$

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