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  a quantity that has both a number and a unit a way of representing a quantity in which a given number is written as the product of two numbers: a coefficient and 10 raised to a power

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1. a quantity that has both a number and a unit
2. a way of representing a quantity in which a given number is written as the product of two numbers: a coefficient and 10 raised to a power.
3. a measure of how close a measurement comes to the actual or true value of whatever is measured.
4. a measure of how close a series of measurements are to one another, irrespective of the actual value.
5. the correct value for the measurement based on reliable references
6. the value measured in the lab
7. the difference between the experimental value and the accepted value
8. the absolute value of the error divided by the accepted value, multiplied by 100%
9. all the digits in a measurement that are directly measured, plus the last digit, which is estimated
10. the revised version of the metric system, adopted by international agreement in 1960