TYPES OF SI UNITS

TYPES OF SI UNIT
SI units are of three types
*)Base units
*)Derived units
*)Supplementary units

BASE UNITS

DEFINITION
The units of seven base physical quantities are defined and standardized and termed as SI base units

1) METER
The distance traveled in vacuum by light wave in 1/299792458 seconds
And the symbol of meter is (m)

2) KILOGRAM
The mass of platinum-iridium alloy cylinder having length and diameter of 3.9 cm kept at IBWM in paris
The symbol of kilogram is (kg)

3) SECOND
The duration in which a cesium atom completes 9192631770 vibrations
The symbol of second is (s)

4) AMPERE
The amount of current when charge flow at the rate 1coulomb/second through a cross section of a conductor
The symbol of ampere is (A)

5) KELVIN
The fraction 1/273.16 of the thermodynamic temperature of the triple point of water (277.16 k)
The symbol of kelvin is (K)

6) MOLE
The amount of a substance containing 6.022×10^23 atom,molecules and ions etc
The symbol of mole is (mol)

7) CANDELA
The radiations of monochromatic source of frequency 540×10^12 Hz and that has radiant intensity of 1/683 watt per steraidan
The symbol of candela is (cd)