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If a certain value of power is written as 

P = 42.3 x 103 W = 42.3 kW, 

P represents the physical quantity of power 
42.3 x 103 is the numerical value {P} 
k is the SI prefix kilo, representing 103 
W is the symbol for the unit of power [P], the watt 
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  volume.  speed, velocity. acceleration. a. wavenumber , density, mass density. surface density. . specific volume.  etc
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