On a cold morning, the air in a car is at 100 % RH, and the partial pressure of the water vapour

Name: Problem 6, Chapter 8: Civil Engineering Materials
Uploaded: 2019-08-18T20:30:18-08:00
Duration: 4 min 17 s
Channel: Averell Hause
Description: On a cold morning, the air in a car is at 100 % RH, and the partial pressure of the water vapour in it is 0.01 bar. As the car warms up, the saturation pressure for water in the air in it is increased to 0.08 bar. Assuming that no water evaporates from surfaces in the car, and the partial pressure of the water vapour remains constant, what will the humidity be?

step 1 So we know that the percent relative humidity would be equaling the vapor density divided by the

Question

On a cold morning, the air in a car is at $100 \% \mathrm{RH}$, and the partial pressure of the water vapour in it is 0.01 bar. As the car warms up, the saturation pressure for water in the air in it is increased to 0.08 bar. Assuming that no water evaporates from surfaces in the car, and the partial pressure of the water vapour remains constant, what will the humidity be?

   On a cold morning, the air in a car is at $100 \% \mathrm{RH}$, and the partial pressure of the water vapour in it is 0.01 bar. As the car warms up, the saturation pressure for water in the air in it is increased to 0.08 bar. Assuming that no water evaporates from surfaces in the car, and the partial pressure of the water vapour remains constant, what will the humidity be?

Civil Engineering Materials

Peter A. Claisse 2015 Edition

Chapter 8, Problem 6

Instant Answer

Solved by Expert Averell Hause

08/18/2019

Step 1

Since the air is at 100% RH, it means that it is saturated with water vapor. Therefore, the partial pressure of the water vapor is equal to the saturation pressure, which is 0.01 bar. Show more…

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On a cold morning, the air in a car is at $100 \% \mathrm{RH}$, and the partial pressure of the water vapour in it is 0.01 bar. As the car warms up, the saturation pressure for water in the air in it is increased to 0.08 bar. Assuming that no water evaporates from surfaces in the car, and the partial pressure of the water vapour remains constant, what will the humidity be?

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Key Concepts

Relative Humidity

Relative humidity is a measure of how much water vapor is present in the air compared to the maximum amount of water vapor the air can hold at a specific temperature. It is expressed as a percentage, representing the ratio of the current water vapor pressure to the saturation vapor pressure at that temperature.

Saturation Vapor Pressure

Saturation vapor pressure is the pressure exerted by water vapor in the air when the air is fully saturated with moisture at a particular temperature. It increases with temperature, meaning that warmer air can hold more water vapor before reaching saturation.

Partial Pressure

Partial pressure refers to the portion of the total pressure exerted by a single gas in a mixture of gases. In the context of moist air, it specifically denotes the pressure contribution of water vapor, which is used along with saturation vapor pressure to determine relative humidity.

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