International System of Units (SI) & Symbols

What is International System of Unit?

The International System of Units (SI), commonly known as the metric system, is the international standard for measurement. It is referred to as SI.

It was adopted as a worldwide system of measurements in 1960 at the 11th General Conference on Weight and Measures in Paris.

The SI is made up of 7 base units that define the 22 derived units with special names and symbols.

Other Definitions of International System of Units

  • The International System of Units (SI) is a scientific method of expressing the magnitudes or quantities of seven important natural phenomena.

What is the importance of International System of Units?

  • It provides the internationally agreed means by which we make such measurements.
  • The principle behind the International System of Units is to provide the same values for measurements such as length, weight, and time no matter where in the world measurement is performed. 
  • It provides definitions of units of measurement that are widely accepted in science and technology.

What do you mean by Base Units?

Students can define the base unit by one of the following three definitions:

  • A base unit is a unit adapted for the measurement of a base quantity
  • The units that describe base quantities are called base units.
  • Base units are defined by a particular process of measuring a base quantity.

Each base quantity has its SI unit.

Tabulate the Base Quantities with their SI units and symbols.

Quantity NameSymbolBase UnitUnit Symbol
Lengthlmeterm
Massmkilogramkg
Timetseconds
Electric CurrentIampereA
Intensity of LightLcandelacd
TemperatureTkelvinK
Amount of a Substancenmolemol
Base Quantities with SI Units & Symbols

What are Derived Units?

Students can define the derived unit by one of the following three definitions:

  • A derived unit is a unit adapted for the measurement of a derived quantity
  • The units that describe derived quantities are called derived units.
  • Derived units are defined by a particular process of measuring a derived quantity.

Derived units are defined in terms of base units and are obtained by multiplying or dividing one or more base units with each other.

Tabulate the Derived Quantities with their SI units and symbols.

Quantity NameSymbolDerived UnitSymbol
Speedvmeter per secondms-1
Accelerationameter per second per secondms-2
VolumeVcubic meterm3
ForceFnewtonN or Kg m s-2
PressurePpascalPa or N m-2
Densitypkilogram per cubic per meterkg m-3
ChargeQcoulombC or As
Derived Quantities, SI Units & Symbols
International System of Units
International System of Units (SI) & Symbols

Quiz

  1. International System of Units is also known as
    1. SI
    2. Metric System
    3. Both of the above
    4. None of the above
  2. International System of Units was adopted as a worldwide system of measurements in
    1. 1958
    2. 1960
    3. 1962
    4. 1964
  3. 11th General Conference on Weight and Measures was held in
    1. France
    2. Germany
    3. Paris
    4. America
  4. The SI is made up of how many base units?
    1. 5
    2. 6
    3. 7
    4. 8
  5. The “meter” is the base unit of
    1. Temperature
    2. Length
    3. Time
    4. None of the above
  6. Pascal is the SI unit of
    1. Force
    2. Pressure
    3. Density
    4. Electric Current
  7. Newton is the SI unit of
    1. Force
    2. Pressure
    3. Density
    4. Electric Current
  8. Mole is the SI unit of
    1. Electric Current
    2. Intensity of Light
    3. Amount of a Substance
    4. Density
  9. Coulomb is the SI unit of
    1. Intensity of Light
    2. Amount of a Substance
    3. Density
    4. Charge
  10. Cubic Meter is the SI unit of
    1. Speed
    2. Acceleration
    3. Force
    4. Volume

Quiz with Answers

0

International System of Units

This quiz will enable you to know the SI, base units, derived units, and their respective SI symbols.

1 / 10

International System of Units is also known as

2 / 10

International System of Units was adopted as a worldwide system of measurements in

3 / 10

11th General Conference on Weight and Measures was held in

4 / 10

The SI is made up of how many base units?

5 / 10

The “meter” is the base unit of

6 / 10

Pascal is the SI unit of

7 / 10

Newton is the SI unit of

8 / 10

Mole is the SI unit of

9 / 10

Coulomb is the SI unit of

10 / 10

Cubic Meter is the SI unit of

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