# Chemistry- Ch. 2

## Terms

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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