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Re: Vapor Density
Posted by: dcarpenter (IP Logged)
Date: July 26, 2006 03:34PM
Gerald,
You wrote:
"The (partial) pressure of water vapor in the atmosphere divided by the equilibrium vapor pressure of pure water and multiplied by 100 yields the relative humidity."
You are correct. Relative humidity is approximately the ratio of the actual to the saturation vapor pressure.
In addition, the relative humidity can also be defined as the ratio of the water vapor density (mass per unit volume) to the saturation water vapor density multiplied by 100%.
Sincerely,
Doug
Douglas J. Carpenter, MScFPE, CFEI, PE, FSFPE
Vice President & Principal Engineer
Combustion Science & Engineering, Inc.
8940 Old Annapolis Road, Suite L
Columbia, MD 21045
(410) 884-3266
(410) 884-3267 (fax)
www.csefire.com
You wrote:
"The (partial) pressure of water vapor in the atmosphere divided by the equilibrium vapor pressure of pure water and multiplied by 100 yields the relative humidity."
You are correct. Relative humidity is approximately the ratio of the actual to the saturation vapor pressure.
In addition, the relative humidity can also be defined as the ratio of the water vapor density (mass per unit volume) to the saturation water vapor density multiplied by 100%.
Sincerely,
Doug
Douglas J. Carpenter, MScFPE, CFEI, PE, FSFPE
Vice President & Principal Engineer
Combustion Science & Engineering, Inc.
8940 Old Annapolis Road, Suite L
Columbia, MD 21045
(410) 884-3266
(410) 884-3267 (fax)
www.csefire.com
| Subject | Views | Written By | Posted |
|---|---|---|---|
 Vapor Density
|
1855 | Ron Hopkins | 07/25/2006 08:56PM |
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Re: Vapor Density
|
1088 | Jim Mazerat | 07/26/2006 08:21AM |
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Re: Vapor Density
|
1221 | dcarpenter | 07/26/2006 09:24AM |
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Re: Vapor Density
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1035 | Gerald Hurst | 07/26/2006 09:40AM |
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Re: Vapor Density |
1011 | dcarpenter | 07/26/2006 03:34PM |
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Re: Vapor Density
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1019 | dcarpenter | 07/26/2006 09:48AM |
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Re: Vapor Density
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992 | Jim Mazerat | 07/26/2006 10:06AM |
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Re: Vapor Density
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1001 | jgmcfps | 07/27/2006 08:44AM |
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Re: Vapor Density
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985 | dcarpenter | 07/27/2006 09:56AM |
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Re: Vapor Density
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982 | jgmcfps | 07/27/2006 02:41PM |
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Re: Vapor Density
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974 | dcarpenter | 07/26/2006 01:17PM |
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Re: Vapor Density
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1044 | Gerald Hurst | 07/26/2006 03:21PM |
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Re: Vapor Density
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1057 | Mike Learmonth | 07/26/2006 08:55PM |
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Re: Vapor Density
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991 | Jim Mazerat | 07/27/2006 09:17PM |
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Re: Vapor Density
|
955 | Mike Learmonth | 07/28/2006 11:34AM |
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Re: Vapor Density
|
997 | Jim Mazerat | 07/28/2006 04:06PM |
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