explain the derived units
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Derived units
Derived units are the combination of base units to express a physical quantity. These are in SI units.
The base units are:
Length in meters (m)
Mass in kilograms (kg)
Time in seconds (s)
Electric current in ampere (A)
Thermodynamic temperature in Kelvin (K)
Amount of substance in mole (mol)
Luminous intensity in candela (cd).
The combination will contain base units in multiplied or divided form.
Example: velocity=displacement/time
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Answer:
◇ Derived Units :
Those physical quantities which are derived from fundamental quantities are called derived quantities and their units are called derived units.
e.g., velocity, acceleration, force, work etc.
◇ Definition of Fundamental Unit :
The seven fundamental units of SI have been defined as under.
◇ Kilogram : A cylindrical prototype mass made of platinum and iridium alloys of height 39 mm and diameter 39 mm. It is mass of 5.0188 x 1025 atoms of carbon-12.
◇ Metre : 1 metre is the distance that contains 1650763.73 wavelength of orange-red light of Kr-86.
◇ Second : 1 second is the time in which cesium atom vibrates 9192631770 times in an atomic clock.
◇ Kelvin : 1 kelvin is the (1/273.16) part of the thermodynamics temperature of the triple point of water.
◇ Candela : 1 candela is (1/60) luminous intensity of an ideal source by an area of cm’ when source is at melting point of platinum (1760°C).
◇ Ampere : 1 ampere is the electric current which it maintained in two straight parallel conductor of infinite length and of negligible cross-section area placed one metre apart in vacuum will produce between them a force 2 x 10-7 N per metre length.
◇ Mole : 1 mole is the amount of substance of a system which contains a many elementary entities (may be atoms, molecules, ions, electrons or group of particles, as this and atoms in 0.012 kg of carbon isotope 6C12.
Explanation: