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the boiling point can be changed by raising or lowering the pressure exerted on the fulids surface why is it important to understand the effect that pressure has on fluids? to move heat from one are to another what is the principle behind mechanical refrigeration? fluids with low boiling points that have certain desirable properties what are commercial refrigerants? exerted force per unit area, usually measured in PSI what is pressure and how is it measured? down in which direction does a solid object exert pressure? equal in all directions in which direction does a gas exert pressure? 10 a solid object which weighs 100 pounds had a bottom that was 10 sq. inches, how much downward pressure would it exert per square inch? 14.7 what is the weight of the atmosphere at sea level? lower pressure allows for easy movement of the molecules in the fluid why does lower pressure allow fluids to boil at a lower temperature? 184 at approximately what temperature will water boil tow miles above sea level? 29.92" HG absolute how high can an inverted column of mercury be supported by atmospheri pressure 2" HG absolute one inch of absolute pressure can support a column of mercury about how high? 20" HG absolute ten psia is equal to how many inches of HG? to read 0 at atmospheric pressure how is the dial type pressure gauge calibrated? 74.7 what would our absolute pressure be if our gauge pressure were 60 psig? vacuums, partial vacuums, inches of mercury vacuum what are pressures below atmospheric commonly called? positive pressures pressures above atmospheric pressure are referred to as what? 0 a 30" column of mercury is equivalent to how many inches of vacuum? micron what unit is the most accurate for measuring deep vacuums? 1" HGA 29" HGV 25400 microns is equal to how many inches of mercury absolute and how many inches of mercury vacuum? compound gauge which gauge reads pressures both above and below atmospheric? 14.7 0 lbs. pressure on a compound gauge is equal to what pressure absolute? 30" HGV how far down does the compound gauge measure? 20" HG absolute a reading of 10" vacuum on the compound gauge would be equal to how high a column of mercury? electronic gauge which test instrument is best for reading deep vacuums?