Explain fundamental and derived units
Answers
Answer:Fundamental units :- These are the units of funds mental physical quantity
Explanation:
Answer:◇ Derived Unit :
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.