descride what is meant by significant figer and order of magnitude
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Order of magnitude refers to rough approximation. Example: around 100 could be anywhere from 50 to 200. Significant figures describes something fairly precise. Example: 1.26 (3 significant figures) means something in the range 1.255 to 1.265.
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The digits, whose values are accurately known in a particular measurement are called significant figures. The number expressing the magnitude of a measurement should be recorded with only as many as digit as properly indicate the accuracy of the measurement
An order of magnitude is an exponential change of plus-or-minus 1 in the value of a quantity or unit. The term is generally used in conjunction with power-of-10 scientific notation.
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