chemistry Ch3

1. comparing an unknown quantity to a known standard unit
6. information collected by recording observations (detailed description or measurement)
9. standard metric system of dimensions used by scientists worldwide
10. 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
11. a ratio of two equivalent measures; the fraction's value is equal to one
13. a collection of related dimensional units
14. any artificial device made for the purpose of refining, extending, or substituting for the human sense when measuring
15. to accurately subdivide into scaled measurement units

2. includes all the known certain digits of the measurement plus one additional estimated digit; an indication of a measurement's precision
3. a quantity used to measure one of the 7 basic dimensions of the universe: space, matter, and time; based on a physical constant
4. any measurable property of an object or a system
5. one of 22 accepted combinations of SI units
7. an evaluation of how exact and reproducible a measurement is; also the exactness of the measuring device
8. a word label that defines one part of a measured dimension
12. an evaluation of how close the measured value is to the actual or accepted value; also applied to the measuring device