chemistry Ch3

3. standard metric system of dimensions used by scientists worldwide
6. one of 22 accepted combinations of SI units
8. a ratio of two equivalent measures; the fraction's value is equal to one
11. a comparison of the measurement error with the size of the measurement itself; a quantity of the uncertainty of a measurement; indication of how accurate measurement is
13. to accurately subdivide into scaled measurement units
14. a quantity used to measure one of the 7 basic dimensions of the universe: space, matter, and time; based on a physical constant
15. information collected by recording observations (detailed description or measurement)

1. comparing an unknown quantity to a known standard unit
2. any measurable property of an object or a system
4. a word label that defines one part of a measured dimension
5. includes all the known certain digits of the measurement plus one additional estimated digit; an indication of a measurement's precision
7. a collection of related dimensional units
9. an evaluation of how exact and reproducible a measurement is; also the exactness of the measuring device
10. an evaluation of how close the measured value is to the actual or accepted value; also applied to the measuring device
12. any artificial device made for the purpose of refining, extending, or substituting for the human sense when measuring