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How many fundamental and supplementary units in SI?

In SI, there are seven base ( fundamental ) units and two supplementary units.


Base unit















































Physical quantity

Unit

Symbol

Mass

Kilogram

kg

Length

Metre

m

Time

Second

s

Temperature

Kelvin

K

Electric current

Ampere

A

Luminous intensity

Candela

cd

Quantity of matter

Mole

mol


Supplementary units



















Physical quantity

Unit

Symbol

Plane angle

Radian

rad

Solid angle

Steradian

sr

Conversion factor


Conversion of length



  • 1 centimetre = 10-2 metre

  • 1 millimetre = 10-3metre

  • 1 micrometre = 10-6metre

  • 1 nanometre = 10-9 metre

  • 1 angstrom= 10-10 metre

  • 1 fermi = 10-15 metre

  • 1 kilometre = 103 metre

  • 1 austronomical unit = 1AU=1.496 × 1011 metre

  • 1 light year = 1 ly = 9.461 ×1015metre

  • 1 mile = 1.609 ×103 metre

  • 1 yard = 0.9144 metre

  • 1 inch = 0.0254 metre



Conversion of time



  • 1 mili second= 10-3 second

  • 1 micro second = 10-6 second

  • 1 neno second = 10-9 second

  • 1 hour = 60 minute = 3600 second

  • 1 day = 24 hours =86400 second

  • 1 year = 365 day = 3.156× 107 second

  • 1 sec = 10-8second



Conversion of mass



  • 1 gram = 10 -3 kg

  • 1 quintal = 100 kg

  • 1 tonne = 1000 kg

  • 1 slug = 14.59 kg

  • 1 Chandersekhar limit = 1.4 × mass of sun = 2.8 × 1030 kg

  • 1 atomic mass unit = 1u = 1.66×10-10

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