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Topic: Saturation vapor pressure

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	Water Vapor Myths: A Brief Tutorial
		The term saturation vapor pressure arose because it was believed that this was the maximum amount of water vapor that could be dissolved in air.
		John Dalton concluded that the vapor pressure of water in air is independent of the existence of the air (Brutsaert 1991, Cardwell 1968, Greenaway 1966, Ostwald 1891, Dalton 1803).
		This is the equilibrium 'student' pressure, analogous to the equilibrium or saturation vapor pressure.
	www.atmos.umd.edu /~stevenb/vapor (1554 words)

	Water Vapor Pressure Formulations
		There is a large number of saturation vapor pressure equations used to calculate the pressure of water vapor over a surface of liquid water or ice.
		It is important to note that in the upper troposphere, water vapor measurements reported in the WMO convention as relative humidity with respect to liquid water depend critically on the saturation vapor pressure equation that was used to calculate the RH value.
		Goff, J. Saturation pressure of water on the new Kelvin temperature scale, Transactions of the American society of heating and ventilating engineers, pp 347-354, presented at the semi-annual meeting of the American society of heating and ventilating engineers, Murray Bay, Que.
	cires.colorado.edu /~voemel/vp.html (1158 words)

	Water Vapor and Vapor Pressure
		The boiling point is defined as the temperature at which the saturated vapor pressure of a liquid is equal to the surrounding atmospheric pressure.
		Raising or lowering the pressure by about 28 mmHg will change the boiling point by 1¡C. Although the vapor pressure variation with temperature is a non-linear one, the boiling point variation can be approximated near 100¡C by an empirical fit of the available data.
		Values were taken from the saturated vapor pressure table for water near 100 degrees C. An empirical fit to these data values was made, and the formula obtained is shown on the diagram.
	www.vivoscuola.it /us/rsigpp3202/umidita/copie/watvap.htm (360 words)

	SKEW-T TUTOR
		Vapor pressure and saturation vapor pressure are found by moving a parcel of air from original pressure level isothermally to the 622 mb pressure surface and reading off the saturation mixing ratio.
		Saturation vapor pressure is the pressure in millibars found graphically on Skew-T by using the temperature.
		This is the pressure level in the atmosphere that a RH of 100% first occurs when air at the surface is heated to a sufficient temperature that allows the air to rise buoyantly on its own.
	www.theweatherprediction.com /thermo/skew-T_tutor (2113 words)

	Water Vapor Pressure Versus Temperature - (Site not responding. Last check: 2007-11-07)
		Saturation vapor pressure is the pressure that water vapor molecules escaping from...
		Saturation vapor pressure is the pressure that water vapor.
		vapor pressure versus temperature curve for a liquid that corresponds to the critical pressure and critical temperature.
	versus.fhyl.com /index.php?k=water-vapor-pressure-versus-temperature (1129 words)

	January 28, 1998
		Recall that vapor pressure is a function of the amount of water vapor in the air.
		Saturation vapor pressure refers to the vapor pressure such that the rate of condensation over a liquid surface would equal the rate of evaporation.
		Saturation vapor pressure is a function of temperature but vapor pressure is not.
	www.ucompass.com /met1010/lectures/012898.htm (1472 words)

	ARL Frequently Asked Questions
		Absolute humidity is the water vapor density, defined as the ratio of the mass of water vapor to the volume of associated moist air and generally expressed in grams per cubic meter.
		We define relative humidity as the ratio of the actual vapor pressure to the saturation vapor pressure at the air temperature, and the result is expressed as a percentage.
		Transpiration of water vapor through leaf stomata depends on the gradient of moisture between the leaf interior (which is saturated) and the overlying air, as well as the availability of moisture in the soil.
	www.arl.noaa.gov /faq/c1.html (1761 words)

	Dew Point Temperature (Site not responding. Last check: 2007-11-07)
		Saturation vapor pressure is calculated as a function of temperature (deg K) using a variation of the integrated form of the Clausius-Clapeyron equation.
		Saturation vapor pressure is accurate to one part in a thousand over the range from —25C to +35C.
		Vapor pressure is then used in the empirical formula to calculate dewpoint temperature.
	meted.ucar.edu /awips/validate/dewpnt.htm (280 words)

	Vapor Pressure
		At this point the vapor is said to be saturated, and the pressure of that vapor (usually expressed in mmHg) is called the saturated vapor pressure.
		The temperature at which the vapor pressure is equal to the atmospheric pressure is called the boiling point.
		But at the boiling point, the saturated vapor pressure is equal to atmospheric pressure, bubbles form, and the vaporization becomes a volume phenomena.
	hyperphysics.phy-astr.gsu.edu /hbase/kinetic/vappre.html#c2 (610 words)

	Atmospheric Moisture
		This is called the saturation vapor pressure and it is the pressure exerted by the water molecules in vapor phase when the vapor is in equilibrium with a plane surface of liquid water.
		One way to think of water vapor being in equilibrium with a plane liquid water surface (saturation conditions) is when the same number of water molecules are moving from a liquid phase to a vapor phase as are moving from a vapor phase to a liquid phase at the interface of the liquid and vapor.
		Obtain the saturation vapor pressure values from this location by going to the vapor pressure link and entering the appropriate temperature for which the saturation vapor pressure is desired.
	www.met.tamu.edu /class/Metr304/Dir-Moisture/moisture.html (3986 words)

	Vapor pressure - Enpsychlopedia (Site not responding. Last check: 2007-11-07)
		This is the equilibrium vapor pressure or saturation vapor pressure of that substance at that temperature.
		At any given pressure, the boiling point of a substance is the temperature at which the vapor pressure of the substance in liquid form equals the total ambient pressure.
		Thus, at any given pressure, the sublimation point of a substance is the temperature at which the vapor pressure of the substance in solid form equals the ambient pressure.
	www.grohol.com /wiki/Vapour_pressure (570 words)

	Relative Humidity: indicates how moist the air is
		Actual vapor pressure is a measurement of the amount of water vapor in a volume of air and increases as the amount of water vapor increases.
		Saturation vapor pressure is a unique function of temperature as given in the table below.
		The relative humidity for air containing 10.2 mb of water vapor is simply 100% times 10.2 mb divided by the saturation vapor pressure at the actual temperature.
	ww2010.atmos.uiuc.edu /(Gh)/guides/mtr/cld/dvlp/rh.rxml (250 words)

	Humidity Conversion
		An equation for the saturation vapor pressure (
		in kPa is the saturation vapor pressure at the wet-bulb temperature (
		is the saturation vapor pressure at the frost-bulb temperature.
	biomet.ucdavis.edu /conversions/HumCon.htm (371 words)

	Vapor Pressure and Humidity (Site not responding. Last check: 2007-11-07)
		The pressure exerted by the air is actually the sum of the partial pressures exerted by the gaseous components of air, including water vapor.
		Thus, the vapor pressure is a good indicator of the number of vapor molecules in the air.
		The vapor pressure at which this occurs is the saturation vapor pressure.
	www.cimms.ou.edu /~cortinas/1014/l11_3.html (307 words)

	[No title]
		Pressure, temperature and either dew point temperature or relative humidity are used in the calculations.
		Saturation vapor pressure in millibars is plotted along the Y axis.
		Derivation of Saturation Vapor Pressure Equation The form of the curve in Figure 1 suggests that there is an exponential relationship between the saturation vapor pressure and temperature, as shown in the notation on the plot.
	members.aol.com /luthben/technote.doc (729 words)

	Equations - Air Density and Density Altitude
		The water vapor pressure can be determined from the dew point or from the relative humidity, and the ambient temperature can be measured in a well ventilated place out of the direct sunlight.
		Although relative humidity can be used to determine the vapor pressure, the value of relative humidity is strongly affected by the ambient temperature, and is therefore constantly changing during the day as the air is heated and cooled.
		Relative humidity is defined as the ratio (expressed as a percentage) of the actual vapor pressure to the saturation vapor pressure at a given temperature.
	www.wahiduddin.net /calc/density_altitude.htm (3829 words)

	CALCULATING RELATIVE HUMIDITY (Site not responding. Last check: 2007-11-07)
		The RH is the amount of moisture in the air (via moisture mass or vapor pressure) divided by the maximum amount of moisture that could exist in the air at a specific temperature (via max moisture mass or saturation vapor pressure).
		The mass of water vapor in a sample of air divided by the mass of dry air is W. The lab technician could then saturated the air (making sure temperature remains the same) and recalculate the mass of water vapor divided by the mass of dry air.
		For any pressure level, the mixing ratio is read through the dewpoint and the saturation mixing ratio is read through the temperature.
	www.theweatherprediction.com /habyhints/186 (482 words)

	Weather Information (Site not responding. Last check: 2007-11-07)
		Generally, with the passage of a cold front, the temperature and humidity decrease, the pressure rises, and the wind shifts (usually from the southwest to the northwest in the Northern Hemisphere).
		The height of the column of mercury in the tube is a measurement of air pressure.
		Generally, with the passage of a warm front, the temperature and humidity increase, the pressure rises, and although the wind shifts (usually from the southwest to the northwest in the Northern Hemisphere), it is not as pronounced as with a cold frontal passage.
	www.nkelectronics.com /ww/info/infoindex.html (6058 words)

	Compressed Air Glossary of Terms :: H :: Pneumatic Manufacturer Directory @ Pneumatic-Source.com (Site not responding. Last check: 2007-11-07)
		Regeneration of the desiccant is accomplished at atmospheric pressure, using steam or electric heaters, embedded in the desiccant bed.
		A valve which connects the high pressure side of a compressed air system to the suction side and is adjusted so as to maintain a specific pressure on the suction side by controlled bleeding of hot gas to the suction side.
		The relative humidity of a gas (or air) vapor mixture is the ratio of the partial pressure of the vapor to the vapor saturation pressure at the dry bulb temperature of the mixture.
	www.pneumatic-source.com /resources/glossary/h.shtml (731 words)

	Untitled Document (Site not responding. Last check: 2007-11-07)
		The actual vapor pressure is exactly what it sounds like and though it may equal the saturation vapor pressure it may not exceed it at a given temperature.
		You would take the saturation vapor pressure value for 21 C (25 mb) and multiply it times.50 to get the actual vapor prussure of 12.5 mb.
		C and the relative humidity were 30% what would the actual vapor pressure and dew point be.
	maps.unomaha.edu /Peake/3510/humidlab1.html (293 words)

	Weather Glossary (Site not responding. Last check: 2007-11-07)
		An area of closed pressure circulation with rotating and converging winds, the center of which is a relative pressure minimum.
		As atmospheric pressure increases, the mercury is forced from the cistern up the tube; when the atmospheric pressure decreases, the mercury flows back into the cistern.
		Refers to the water vapor content in the atmosphere, or the total water, liquid, solid or vapor, in a given volume of air.
	www.weatheressentials.com /index.asp?PageAction=Custom&ID=7 (5988 words)

	Mount Washington Observatory: Glossary of Weather Terms (Site not responding. Last check: 2007-11-07)
		The amount of water vapor in a volume of space when in equilibrium with the liquid phase at a given temperature.
		The vapor pressure in the air is in equilibrium with the vapor pressure over a plane surface of pure water so that the rate of evaporation and condensation are equal.
		The saturation vapor pressure is temperature dependent, which differs for a flat or curved liquid surface (such as a spherical droplet).
	www.mountwashington.org /glossary/gloss.html (2233 words)

	Humidity Conversion
		Vapor Pressure from Temperature, Wet-bulb Temperature, and Barometric Pressure
		is the saturation vapor pressure at air temperature in kPa,
		are slopes of the saturation vapor pressure curves at the air and dew point temperatures.
	biomet.ucdavis.edu /conversions/humidity_conversion.htm (111 words)

	[No title]
		Saturation is a condition in which the gas and a non-gas phase coexist in equilibrium.
		The fundamental variable used to define saturation (or the lack of it) is the partial pressure of the gas.
		For water substance we simply refer to the vapor pressure, "e." The saturation vapor pressure (es) with respect to liquid water is defined over a plane surface of pure water.
	trc.ucdavis.edu /ATM_ECI149/Notes/Gas2PartConversion-04-16.doc (924 words)

	CHAPTER 6 HUMIDITY, SATURATION, AND STABILITY (Site not responding. Last check: 2007-11-07)
		The saturation vapor pressure is _______ proportional to air temperature.
		The saturation mixing ratio is _______ proportional to air temperature.
		The mixing ratio is 10 g/kg and the relative humidity is 40%.
	www.uwgb.edu /moranj/chapter6.htm (255 words)

	[No title]
		Heymsfield formula ar = ts/T br = 7.90298(ar-1.) cr = 5.02808math.log10(ar); dw = (1.3816E-07)(10.(11.344(1.-1./ar))-1.) er = 8.1328E-03((10.(-(3.49149(ar-1.))))-1.) vp = 10.*(cr-dw+er+sr-br) vp=vp1.0e02 return(vp) def satvpg(T): #This is the saturation vapor pressure computation used in the #GFDL climate model.
		It blends over from water saturation to #ice saturation as the temperature falls below 0C.
		# #Usage example: # To set up a function e(T) that approximates the saturation # vapor presure for a substance which has a latent heat of # 2.5e6 J/kg, a molecular weight of 18 and has vapor pressure # 3589.
	geosci.uchicago.edu /~rtp1/geo232/PythonShop/phys.py (276 words)

	Saturation Vapor Pressure - Dependence on Air Temperature (Site not responding. Last check: 2007-11-07)
		Saturation Vapor Pressure - Dependence on Air Temperature
		Saturation vapor pressure is dependent on the temperature of a gas according the the graph to the right -->>
		Q: For an unsaturated parcel of air at a given temperature, there are two ways to saturate it where the vapor pressure will then equal the saturation vapor pressure...
	apollo.lsc.vsc.edu /classes/met130/notes/chapter5/es_temp.html (56 words)

	Saturaton Vapor Pressure (Site not responding. Last check: 2007-11-07)
		Clausius Clayperon Equation (Latent Heat of Vaporization Lv is a function of T) (0.5% within -20C to 30 C)
		Flatau, P.J., R. Walko, and W. Cotton, 1992 : Polynomial fits to Saturation Vapor Pressure, Journal of Applied Meteorology, 31, 1507-1513.
		A., 1978: On the Approximation of Saturation Vapor Pressure.
	hurri.kean.edu /~yoh/calculations/satvap/satvap.html (270 words)

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