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Question

Define the unit of measurement in physics.


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Solution

  1. When we measure a physical quantity, we always compare it with a standard that has the same nature as that of the given quantity. This standard is called a unit.
  2. There are seven fundamental units in physics:

meter………….. unit of length

kilogram………...unit of mass

second…………..unit of time

ampere……………unit of current

kelvin……………unit of temperature

mole ……………..unit of amount of matter

candela …………. unit of luminous intensity.

3. Besides this, there are two other supplementary units

radian ……….. unit of plane angle

steradian ……….. unit of solid angle


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