| Term | Definition |
|---|
| Length, Mass, Time | The three Fundamental Units of Measurment |
| Length | The distance between two points |
| Meter | Unit of measurement for length; 39.97" |
| Centimeter | .01 or 10^-2 meter |
| Millimeter | .001 or 10^-3 meter |
| Angstrom | .0000000001 or 10^-10 meter |
| Kilometer | 1,000 or 10^3 meter |
| Mass | Represents the quantity of matter in a body; determined by WEIGHT |
| Kilogram | Unit of measurement for mass; 2.2 lbs |
| Gram | .001 kg or 10^-3 kg |
| Time | Represents the measure of the duration of events |
| Second | Unit of measurement for time |
| British | System of units represented in: foot, pound, seconds |
| CGS | System of units represented in: centimeter, gram, seconds |
| MKS | System of units represented in: Meter, kilogram, seconds |
| SI base units | System of units represented in: meter, kilogram, second |
| Expanded base units | Ampere, kelvin, mole, candela |
| Gray (Gy) | SI unit of absorbed radiation does; "rad" in British system |
| Sievert (Sv) | SI unit of of dose equivalent (rem) |
| Becquerel (Bq) | SI unit of radioactivity (Curie) |
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