Why there is the need for International Standard Units realized? Explain with suitable examples.


A long time ago, people from different countries had different ways of measuring things, which made it harder for them to trade or business. People need to measure what they buy and exchange for them to prosper, but not having a common and correct way of measuring was a problem.

With the development in the field of science and technology, the need for a commonly accepted system of units is realized all over the world particularly to exchange scientific and technical information. Finally, scientists came up with "The International System of Units (SI, abbreviated from the French Système International d’Unités) is the modern form of the metric system that replaces all other existing ways we measure objects. It is the only system of measurement with official status in nearly every country in the world.

SI unit enables us to calculate easily by being a constant term of measurement throughout the world.

It comprises a coherent or consistent system of units measurement starting with seven base units, which are-

1. Second (the unit of time with the symbol s),

2. Metre (the unit of length, with the symbol m),

3. Kilogram (the unit of mass, with the symbol kg),

4. Ampere (the unit of electric current, with the symbol A),

5. Kelvin (the unit of thermodynamic temperature, with the symbol K),

6. Mole (the unit of amount of substance, with the symbol mol), 

7. Candela (the unit of luminous intensity, with the symbol cd).

Even if we use other forms of measurement, we can easily convert these into SI units by following the conversion table.

The SI unit is necessary to ensure that our everyday measurements remain comparable and consistent worldwide because without the SI unit there would be confusion as to which unit (of measurement) is to be taken to measure a certain quantity.

For example- If we take cubit or handspan to measure something than it will vary person to person, while SI unit remains constant everywhere.

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Updated on: 10-Oct-2022

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