PHYSICAL QUANTITIES:–

  • “PHYSICAL QUANTITIES” which can describe the laws of physics and possible to measure .
  • The physical quantities which do not depend upon other physical quantities are called “fundamental quantities”.
  • Mass,Length,Time,Temperature,Luminous Intensity, Electric current and Amount of substances are the fundamental quantities in “STANDARD SYSTEM”.
  • “DERIVED QUANTITIES” are the physical quantities which depends on fundamental quantities.

 SYSTEM OF UNITS:-

  • The unit of a physical quantity is the reference standard used to measure it.
  • CGS: Centimeter/Gram/second
  • FPS: Foot/Pound/second
  • MKS: Meter/Kilogram/second
  • SI system :It is the modified form of MKS system, developed by French people.
FUNDAMENTAL PHYSICAL

QUANTITY

FUNDAMENTAL UNIT
MASS(M) Kg(KILOGRAM)
LENGTH(L) m(METER)
TIME(T) s(SECOND)
TEMPERATURE K(KELVIN)
ELECTRIC

CURRENT (I)

A(AMPERE)
LUMINOUS INTENSITY Cd(CANDELA)
AMOUNT OF SUBSTANCE mol(MOLE)

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