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BJU Chemistry Ch 3
Bob Jones Chemistry - Chapter 3
Term | Definition |
---|---|
accuracy | A numerical evaluation of how close a measurement is to an accepted value; the measurement of error. |
base unit | One of seven units in the SI that measures a basic dimension from which all other metric dimensional units are derived. They are the meter, kilogram, second, kelvin, mole, ampere, and candela. |
conversion factor | A ratio that is constructed from the relationship between two units and is equal to 1. |
derived unit | Any mathematical combination of the base units. The SI contains 22 derived units. |
dimension | Any measurable property of the physical universe. |
graduated | Accurately subdivided into measurement units. |
measurement | The act of comparing an unknown quantity to a standard; a number that indicates quantity and is followed by a unit. |
metric system | Any measuring system in which units are related to each other by multiples of 10. |
percent error | A quantity derived from a method that compares the magnitude of the measurement error with the size of the measurement. |
precision | A quantitative evaluation of the exactness of a measurement or measuring instrument; the fineness of a scale's subdivisions. |
scale | A means of measuring that is subdivided into units of measurement. |
SI | The metric system adopted by the scientific community. |
significant digit | A digit that indicates a measurement's precision. Significant digits consist of all the certain digits plus one estimated digit. |
unit | A label used to specify a measurement's dimension, such as "inch" or "meter". |
unit conversion | Multiplication of a measurement by a conversion factor. |