There various system of measurement in the world. To get an idea of anything in the world, we need to measure it and this measurement is always associated with number and quantities. According to Wikipedia, "A system of measurement is a collection of units of measurement and rules relating them to each other".
There were various measurement systems in various civilizations around the world but, at present, two systems are more stable or popular or agreed and these are Metric System and International System of Units(SI). The International System of Units (SI) is the modern form of the metric system, and is the most widely used system of measurement.
Metric System:
The Metric System was developed by French in 18th century. Previously in Europe, there were other system of measurements in different places but most of the European countries were formulating a unique measurement throughout the country and they were benefiting in trade and business. The inconsistency problem in the size of units of measure was prevalent in France that led them to adopt a completely new system of measurement. A Commission was set up and it submitted a report in the National Assembly and a decimal-based system of measurement was finally accepted by the leaders. Gradually this system was introduced in other countries specially in non-english speaking countries and it got popularity. US is the only country that has not accepted it as its official system of measurement.
The whole system was derived from the properties of natural objects, namely the size of the Earth and the weight of water, and simple relations in between one unit and the other.
The International System of Units (SI):
The International System of Units (SI) is new and it can be said that it is a modern form of Metric System. It is universally abbreviated SI (from the French Le Système. International d'Unités). This system was published after second world war.
German mathematician Gauss, in 1932, defined the second as a base units. He measured earth’s magnetic field by three units: millimeter, gram and second. Later in 1860, Maxwell and Thomson formulated the concept of a coherent system of units with base units and derived units.
Finally in 1960, at 11th CGPM(General Conference on Weights and Measures), The International System of Units (SI) was published.
7 base units are:
There were various measurement systems in various civilizations around the world but, at present, two systems are more stable or popular or agreed and these are Metric System and International System of Units(SI). The International System of Units (SI) is the modern form of the metric system, and is the most widely used system of measurement.
Metric System:
The Metric System was developed by French in 18th century. Previously in Europe, there were other system of measurements in different places but most of the European countries were formulating a unique measurement throughout the country and they were benefiting in trade and business. The inconsistency problem in the size of units of measure was prevalent in France that led them to adopt a completely new system of measurement. A Commission was set up and it submitted a report in the National Assembly and a decimal-based system of measurement was finally accepted by the leaders. Gradually this system was introduced in other countries specially in non-english speaking countries and it got popularity. US is the only country that has not accepted it as its official system of measurement.
The whole system was derived from the properties of natural objects, namely the size of the Earth and the weight of water, and simple relations in between one unit and the other.
| Name | The Number | Power | Prefix | Symbol |
| trillion | 1,000,000,000,000 | 1012 | tera | T |
| billion | 1,000,000,000 | 109 | giga | G |
| million | 1,000,000 | 106 | mega | M |
| thousand | 1,000 | 103 | kilo | k |
| hundred | 100 | 102 | hecto | h |
| ten | 10 | 101 | deka | da |
| unit | 1 | 100 | ||
| tenth | 0.1 | 10-1 | deci | d |
| hundredth | 0.01 | 10-2 | centi | c |
| thousandth | 0.001 | 10-3 | milli | m |
| millionth | 0.000 001 | 10-6 | micro | µ |
| billionth | 0.000 000 001 | 10-9 | nano | n |
| trillionth | 0.000 000 000 001 | 10-12 | pico | p |
The International System of Units (SI):
The International System of Units (SI) is new and it can be said that it is a modern form of Metric System. It is universally abbreviated SI (from the French Le Système. International d'Unités). This system was published after second world war.
German mathematician Gauss, in 1932, defined the second as a base units. He measured earth’s magnetic field by three units: millimeter, gram and second. Later in 1860, Maxwell and Thomson formulated the concept of a coherent system of units with base units and derived units.
Finally in 1960, at 11th CGPM(General Conference on Weights and Measures), The International System of Units (SI) was published.
7 base units are:
| Quantity | Name | Symbol |
|---|---|---|
| Length | meter | m |
| Mass | kilogram | kg |
| Time | second | s |
| Electrical Current | ampere | A |
| Temperature | kelvin | K |
| Amount of substance | mole | mol |
| Luminous intensity | candela | cd |
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