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BJU Chemistry Ch 3

Bob Jones Chemistry - Chapter 3

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.
Created by: heidio