Pearson eText for Exercises for Weather & Climate -- Instant Access (Pearson+)
Pearson eText for Exercises for Weather & Climate -- Instant Access (Pearson+)
9th Edition
ISBN: 9780137612949
Author: Greg Carbone
Publisher: PEARSON+
Textbook Question
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Chapter 7, Problem 1E

Consider the air sample denoted by an asterisk (*) in Figure 7-2. Its temperature is –15°C and its vapor pressure is 1.72 mb. What is its relative humidity with respect to water if, at –15°C, the saturation vapor pressure over liquid water is 1.91 mb? (Your answer should be less than 100%, indicating an unsaturated sample.)

Expert Solution & Answer
Check Mark
To determine

The relative humidity with respect to water if at 15C, the saturation vapor pressure over liquid water is 1.91 mb and vapor pressure is 1.72 mb.

Answer to Problem 1E

The relative humidity of air sample is 90%.

Explanation of Solution

Temperature=-15oCVapor pressure=1.72mbSaturationvaporpressure=1.91mb

The expression used to calculate relative humidity is as follows.

Relativehumidity=VaporpressureSaturationvaporpressure×100

Substitute 1.72mb for vapor pressure 1.91mb for saturation vapor pressure to find the relative humidity.

Relativehumidity=1.721.91×100= 0.9005×100= 90%

Therefore, the relative humidity of air sample is 90%.

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