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What is specific gravity? what do you mean by 1pascal? Concept of pressure difference?
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The "specific gravity" of a meterial is the ratio of its density to the density of water at 40 C, 1000 kg/m3, it is a pure number with out uinits.The "pascal" can be expressed using SI derived units, or alternatively solely SI base units,and a unit of pressure equal to one newton per squre meter.The difference between two levels of pressure. During operation, valves often experience different pressure levels downstream and upstream.
A piston-cylinder assembly fitted with a paddle wheel contains air, initially at p1=30 lbf/in2, T1=540 °F, and V1=4 ft3. The air undergoes a process to a final state where p2=20 lb
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