in steam tables, i found that the temperature that corresponds to 0.5 bar was 81.33 degree which is the saturated temperature , to find the thermodynamic properties of water deal with it as a saturated liquid or saturated vapour ??
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Answer:
PROCEDURE FOR FINDING PROPERTIES FROM TABLES
Note: Although this procedure is written in terms of the properties of water (steam), it works just as well for other fluids, such as ammonia and the various refrigerants. The table references are to the textbook by Cengel and Turner, "Fundamentals of Thermal-Fluid Sciences, Second Edition. Also, the following procedure assumes that the temperature is above the triple point temperature, so that only the liquid and vapor phases are involved. If thermodynamic data are available, the same procedure will work for lower temperatures.
Values of two independent properties will determine the state and allow all other properties to be found.The procedure for finding the other properties depends on which two properties are known.