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Units

Units

Units

Units

The chosen standard used for measuring a physical quantity is called unit.

System of Units

Few internationally accepted systems are

  1. CGS system
  2. FPS System
  3. SI Units.

SI Base Units

There are 7 Base Units in SI system. They are –

Base QuantityUnitSymbol
LengthMetrem
MassKilogramkg
TimeSeconds
Electric CurrentAmpereA
Thermodynamic temperatureKelvinK
Amount of substanceMolemol
Luminous intensityCandelacd

SI Supplementary Units

Supplementary QuantityUnitSymbol
Plane angleRadianrad
Solid angle SteradianSr

Standard Units

viscocitypascal second
Powerdioptre
Inductancehenry
Loudnessphon
Magnetic inductancetesla
Magnetic fluxweber
Electric chargecoulomb

Important Prefixes to Units

    1. Tera (T) 1012
    2. Giga (G) 109
    3. Mega (M) 106
    4. kilo (K) 103
    5. hecto (h) 102
    6. deka (da) 10
    7. deci (d) 10–1
    8. centi (C) 10–2
    9. mili (m) 10–3
    10. Micro (µ) 10–6
    11. nano (n) 10–9
    12. Pilo (P) 10–12
    13. Femp (f) 10–15
    14. atto (a) 10–18

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