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) |