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What is unit ? Write its types....

What is unit ? Write its types.

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To describe natural and man made events around us many concepts are required. These concepts are called quantity,
There are two types of unit.
(1) Fundamental uantity : Minimum number of quantities which are independent of each other and by using these quantities any event can be described are called fundamental quantities
E.g. : length, mass and time .
(2) Derived quantity : Quantity which are obtained by using fundamental quantity are called derived quantity.
E.g.: velocity, acceleration, force, work, power
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