| A | B |
|---|
| qualitative measurements | measurement that gives descriptive, nonnumeric results |
| quantitative measurements | a measurement that gives definite, usually numeric results |
| Scientific Notation | expression of numbers in the form n x 10^n |
| accuracy | the closeness of a measurement to the true value of what is being measured |
| precision | describes the closeness, or reproductiblity, of a set of measurements taken under the same conditions |
| accepted value | a quantity used by general agreement of the scientific community |
| experimental value | the quantitative value measured during an experiment |
| error | the diffrence between the accepted value and the experimental value |
| percent error | the percent that a measured value differs from the accepted value |
| significant figures | all the digits that can be known precisely in a measurement, plus a last estimated digit |
| International System of Units | the revised version of the metric system, adopted by international agreement in 1960 |
| meter | the base unit of length in SI |
| volume | the space occupied by a sample of matter |
| weight | force that measures the pull of gravity on a given mass |
| density | the ratio of mass of an object to its volume |
| specific gravity | the ratio of the density of a substance to that of a standard substance (usually water) |
| hydrometer | a device used to measure the specific gravity of a liquid |
| temperature | a measure of the kinetic energy of particles in matter; determines the direction of heat transfer |
| Celsius scale | the temperature scale on which the freezing point of water is 0 degrees and the boiling point is 100 degrees |
| Kelvin scale | the temperature scale in which the freezing point of water is 273 and the boiling point is 373 |
| absolute zero | the zero point on the kelvin temperture scale equivalent to -273 C, all molecular motion theoretically stops at this temperature |
