Quantcast Intensive and Extensive Properties

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THERMODYNAMIC PROPERTIES Thermodynamics Specific Gravity Specific  gravity  (S.G.)  is  a  measure  of  the  relative  density  of  a  substance  as  compared  to  the density  of  water  at  a  standard  temperature.    Physicists  use  39.2°F  (4°C)  as  the  standard,  but engineers  ordinarily  use  60°F.   In  the  International  System  of  Units  (SI  Units),  the  density  of water  is  1.00 g/cm3  at  the  standard  temperature.  Therefore,  the  specific  gravity  (which  is dimensionless) for a liquid has the same numerical value as its density in units of g/cm3.   Since the density of a fluid varies with temperature, specific gravities must be determined and specified at particular temperatures. Humidity Humidity  is  the  amount  of  moisture  (water  vapor)  in  the  air.   It  can  be  expressed  as  absolute humidity or relative humidity.   Absolute humidity is the mass of water vapor divided by a unit volume  of  air  (grams  of  water/cm3  of  air).    Relative  humidity  is  the  amount  of  water  vapor present in the air divided by the maximum amount that the air could contain at that temperature. Relative  humidity  is  expressed  as  a  percentage.    The  relative  humidity  is  100%  if  the  air  is saturated with water vapor and 0% if no water vapor is present in the air at all. Intensive and Extensive Properties Thermodynamic  properties  can  be  divided  into  two  general  classes,  intensive  and  extensive properties.    An  intensive  property  is  independent  of  the  amount  of  mass.  The  value  of  an extensive property  varies directly with the mass.   Thus, if a quantity of matter in a given state is divided into two equal parts, each part will have the same value of intensive property as the original and half the value of the extensive property.   Temperature, pressure, specific volume, and  density  are  examples  of  intensive  properties.    Mass  and  total  volume  are  examples  of extensive properties. HT-01 Page 4 Rev. 0


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