Describe what is meant by significant figures and order of magnitude
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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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The order of magnitude of a physical quantity is its magnitude in powers of ten when the physical quantity is expressed in powers of ten with one digit to the left of the decimal. ... If they differ by two orders of magnitude, they differ by a factor of about 100.
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