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Which definition is more clear?

  1. Sep 7, 2009 #1
    Which definition is more clear and correct ?
    1)Any thing that has a measurement is called a physical quantity.
    2)Characteristics that can be given to a matter is called physical quantity.
     
  2. jcsd
  3. Sep 7, 2009 #2

    Hootenanny

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    I would say that neither are correct. A physical quantity can not only be measured, but also calculated. And a photon is not matter, but has several physical quantities.
     
  4. Sep 7, 2009 #3
    What about this one ?
    Any thing that has a measurement and can be expressed in the form of a number is called physical quantity.
     
  5. Sep 7, 2009 #4
    Eh, in my opinion, both are highly unclear and imprecise definitions...though I'll pick 1) if I had no choice. A physical quantity would be a physical property that, as its name suggests, is quantifiable. "Anything" is a terribly vague term, as is "measurement".
    As for 2), "Characteristics" is too broad and sweeping a term - colour for example is most definitely not a physical quantity.
     
  6. Sep 7, 2009 #5

    Hootenanny

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    Again, what about calculating a physical quantity? And you need to define 'measurement', before you can use it.
     
  7. Sep 19, 2009 #6
    Why photon is not considered as matter?
     
  8. Sep 19, 2009 #7
    well its more accurate to consider it as a packet of energy, keeping in mind matter can be turned to energy and vice versa , i think 'physical' itself should be defined , maybe even some criteria to differentiate physical from non-physical.
     
    Last edited: Sep 19, 2009
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