| A | B |
|---|
| accuracy | refers to how close a measured value is to an accepted value |
| base unit | a defined unit in a system ofmeasurement that is based on an object or event in the physical world and is independent of other units |
| conversion factor | a ratio of equivalent values used to express the same quantity in different units; is always equal to 1 and changes the units of a quantity without changing its value |
| density | a ratio that compares the mass of an object to its volume |
| derived unit | a unit defined by a combination of base units |
| dimensional analysis | a problem-solving method that focuses on the units that are used to describe matter |
| graph | a visual representation of information, such as a circle graph, line graph, or bar graph, that can reveal patterns in data |
| kelvin | the SI base unit of temperature |
| kilogram | the SI base unit for mass; about 2.2 pounds |
| liter | the metric unit for volume equal to one cubic decimeter |
| meter | the SI base unit for length |
| percent error | the ratio of an error to an accepted value |
| precision | refers to how close a series of measurements are to one another; precise measurements show little variation over a series of trials but may not be accurate |
| scientific notation | expresses numbers as a multiple of two factors-a number between 1 and 10, and 10 raised to a power, or exponent; makes it easier to handle extremely large or small measurements |
| second | the SI base unit for time |
| significant figures | the number of all known digits reported in measurements plus one estimated digit |
