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In physics, the measurement deals with physical quantity
only. Quantity can be classified into two types; they are physical and
non-physical quantity.
Physical Quantities are those quantities that can be
measured, either directly or indirectly. Some physical quantities are dependent
on other quantities while others do not depend on any further quantities except
themselves. The examples of physical quantities are: Mass, Acceleration,
Temperature, Force, Pressure, Electric Current, Potential Difference, etc. On
the basis of their dependency, they are further classified into two types; they
are Fundamental and Derived Quantity. We will discuss about them in next post.
Unlike physical quantities, non-physical quantities are
those quantities that cannot be measured by any mean or media. These quantities
do not have magnitude of themselves. Some example of non-physical quantities
are: Feelings, Angriness, Rudeness, etc. No one can measure the feeling of a
person, or love, etc.
Hence these things cannot be measured and therefore are
known as non-physical quantity.
This is a horrible description of "non-physical" quantities. In theory, if we knew precisely what feelings were and how to experimentally measure them, then they would be physical. Non-physical quantities cannot be measured even in theory. These include scalar/vector potentials, wavefunctions, etc.
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