Calculating Saturation Vapor Pressure?

  • #1
I'm trying to find the equations or diagrams for two types of Saturation Vapor Pressures:

1) Pw = Saturation vapor pressure at water temperature
2) Pa = Saturation vapor pressure at air dew point

My solution:

Relative humidity = (saturation vapour pressure at dew point)/( saturation vapour pressure at the existing air temperature). Since I know what the relative humidity is, I can find the SVP at dew point if I can calculate the SVP at the existing air temperature.

From the following link;
http://www.engineeringtoolbox.com/water-vapor-saturation-pressure-air-d_689.html
Question 1: Is "Pws= the saturation pressure of water vapor in moist air" equivalent to 1) or 2) or is it equivalent to "saturation vapour pressure at the existing air temperature"?

Question 2: From the link, is pw = partial pressure water vapor equal to 1)?
 

Answers and Replies

  • #2
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I'm trying to find the equations or diagrams for two types of Saturation Vapor Pressures:

1) Pw = Saturation vapor pressure at water temperature
2) Pa = Saturation vapor pressure at air dew point

My solution:

Relative humidity = (saturation vapour pressure at dew point)/( saturation vapour pressure at the existing air temperature). Since I know what the relative humidity is, I can find the SVP at dew point if I can calculate the SVP at the existing air temperature.

From the following link;
http://www.engineeringtoolbox.com/water-vapor-saturation-pressure-air-d_689.html
Question 1: Is "Pws= the saturation pressure of water vapor in moist air" equivalent to 1) or 2) or is it equivalent to "saturation vapour pressure at the existing air temperature"?
It is (2).
Question 2: From the link, is pw = partial pressure water vapor equal to 1)?
1 what? What are the units.
 

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