| A | B |
|---|
| quantity | technical term for properties that can be measured |
| quantitative property | property of matter that can be measures, such as length, mass, density |
| qualitative property | poperty of matter that can ony be described by words, such as color, appearance |
| SI system | international system of unts used by scientists, also known as metric system |
| SI base units | fundamental units of the SI (metric) system |
| meter | SI base unit of length |
| gram | SI base unit of mass |
| second | SI base unit of time |
| mole | SI base unit for amount of a substance |
| kelvin | SI base unit of thermodynamic temperature |
| ampere | SI base unit of electric current |
| candela | SI base unit of luminosity |
| liter | SI base unit of volume |
| SI prefixes | used to form larger or smaller units from SI base units, increase or decrease in always in multiples of 10 |
| tera- (T) | prefix for one trillion times base unit |
| giga- (G) | prefix for one billion times base unit |
| mega- (M) | prefix for one million times base unit |
| kilo- (k) | prefix for one thousand times base unit |
| hecto- (h) | prefix for one hundred times base unit |
| deca- (da) | prefix for ten times base unit |
| deci- (d) | prefix for one tenth of base unit |
| centi- (c) | prefix for one hundredth of base unit |
| milli- (m) | prefix for one thousandth of base unit |
| micro- | prefix for one millionth of base unit |
| nano- (n) | prefix for one billionth of base unit |
| pico- (p) | prefix for one trillionth of base unit |
| SI derived units | units of measurement made up of combinations of SI base units often determined by mathematical representations for specific quantities |
| square meter | base derived unit for area |
| cubic meter | base derived unit for volume |
| meter per second | base derived unit for speed or velocity |
| kilogram per cubic meter | base derived unit for density |
| mole per cubic meter | base derived unit for concentration |
| newton (meter kilogram per square second) | basic derived unit for force |
| pascal (kilogram per meter square second) | basic derived unit for pressure |
| joule (cubic meter kilogram per square second) | basic derived unit for enerrgy, work, and quantity of heat |
| accuracy | how close a measurement is to a true or accepted value |
| significant figures | digits in a measurement that are KNOWN plus one digit that has an estimated value |
| observed value | value based on a scientist's laboratory measurements |
| true value | most probable value based on generally accepted references |
| absolute error | the difference between the observed value and the true value |
| percent error | calculation of relative error which indicated the accuracy of a scientist's lab observations, it is calculated by dividing the absolute error by the true value and multiplying the quotient by 100% |
