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Glossary of Chemistry- Ch. 2

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base unit
A defined unit in a system of measurement that is based on an object or event in the physical world
second
The base unit for time
meter
The base unit for length
kilogram
The base unit for mass
derived unit
A unit defined by a combination of base units
liter
Unit of volume
density
The ratio that compares the mass of an object to its volume
kelvin
the base unit of temperature
scientific notation
Expression of numbers as a multiple of two facotrs: a number between one and ten; and ten raised to a power
conversion factor
A ratio of equivalent values used to express the same quantity in different units
dimensional analysis
A method of problem solving that focuses on the units to describe matter
accuracy
Relates a measured value to an accepted value
precision
Refers to how close a series of measurements are
percent error
ratio of an error to an accepted value
significant figure
All known digits plus one estimated digit

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