# Calculating Saturation Vapor Pressure?

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.

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)?

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Chestermiller
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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.