Vapor Pressure
From the user, an air temperature
and a dewpoint temperature
are given.
To convert the saturated vapor pressure and/or the actual vapor pressure, the
temperature values must be converted to degrees Celsius 
For information on how to do this see the link below:
tempConvert.php
Then, the saturated vapor pressure
and the actual vapor
can be calculated using the formula listed below:

For a bonus answer, after calculating the vapor pressures the relative humidity
can be calculated using the formula below:

The vapor pressure answers will be in units of millibars
or hectoPascals 
To convert the vapor pressure to other units, see the link below:
pressureConversion.php
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