Question Bank • QB_APE_EXP_015 NAT • 2 Marks

Section 6: Agricultural Process Engineering

Evaporation and Drying

Subtopic: Psychrometry – properties of air-water vapour mixture

Question Statement:

At a dry bulb temperature of $25^\circ\text{C}$, the saturation vapor pressure of water is $3.169\text{ kPa}$. If the actual partial pressure of water vapor is $1.901\text{ kPa}$, the relative humidity ($RH$) of the air in percentage is ________ (round off to nearest integer).

Answer Key:

60

Step-by-Step Solution & Explanation

Relative humidity $RH$ is defined as: $RH = \frac{p_v}{p_{vs}} \times 100 = \frac{1.901}{3.169} \times 100 = 0.59987 \times 100 \approx 60.0\%$
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