[7 SI Units] Standard Units of Measurement || All SI Units

All The SI Units

 The International System of Units(SI), generally known as the metric system ,it is the international standards for all measurements.

All SI Units

The System International (SI) is made up with 7 base units. The 7 SI base units are….

Standard Units of measurement:

· m - Meter - Length

· s - Second - Time

· mol - Mole - Amount of Substance

· A - Ampere - Electric Current

· K - Kelvin - Temperature

· cd - Candela - Luminous Intensity

· kg - Kilogram – Mass

Quantity	Unit	Symbol	Definition
Length	Meter	m	The distance travelled by light in vacuum in 1/299792458 second is called 1m.
Mass	kilogram	kg	1 kilogram is considered as the definite amount of mass, which is the mass of a cylinder made of platinum-iridium of height and diameter 3.9 cm kept in a certain building in France.
Time	Second	s	The time required to complete 9192631770 vibrations by a Cesium-133(Cs133) atom is called one second.
Electric current	Ampere	A	When electric current flows through two wires in the same direction they attract one another. The amount of current that flows through two parallel wires separated by 1 m and if they attract one another with 2107 N force per meter, that amount of current is called one ampere.
Temperature	Kelvin	K	The temperature we get when the triple point temperature of water is divided by 273.16 is called one Kelvin.
Amount of Substance	Mole	mol	One mole is defined as the amount of substance that is contained in a definite number of fundamental particles (molecule, atom or ion) which is equal to the number of atoms contained in 0.012 kilogram of carbon-12 atom.
Luminous Intensity	Candela	cd	One candela is defined as the amount of luminous intensity of a source of light which emitted in one steredian solid angle of luminous intensity of 1/683 part of 1 watt.

These are the seven base system international units and their identities. But in general, easily we can measure them by this way.

• The distance from the feet to the stomach of a person of normal height is nearly one meter.

• The water contained in one litter bottle or water of four glasses have a mass of nearly one kg.

• The time required to say three words ‘one thousand one’ is approximately one second.

• If three mobile phones are charging at the same time, one ampere electric current is used. (a mobile is charged at nearly 5 V. So, current consumption will be 5watt. If lights, fans, refrigerator of a residence run at 220 V and one ampere current is used then the power consumption will be 220 watt).

• If we feel the fever of anyone by touching with hand, then it will be said that his temperature has increased by one Kelvin.

• It is difficult to realize a mole, we can say a water filled large spoon contains one mole of water molecules. In one cup water, there are ten moles.

• Light from a single candle can be said one candela.

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