Defination of unit in physics
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In physics and metrology, units are standards for measurement of physical quantities that need clear definitions to be useful. Reproducibility of experimental results is central to the scientific method. A standard system of units facilitates this.
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The word unit as used in physics refers to the standard measure of a quantity. Some fundamental quantities and their respective units are:
time —- second
mass —- kilogram
length —- meter
temperature —- Kelvin
electric current —- ampere
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