| A | B |
|---|
| sytem | a specific portion of matter in a given region of space that has been selected for study during an experiment or observation |
| hypothesis | a testable statement |
| model | more than a physical object; usually an explanation of how phenomena occur and how data or events are related |
| theory | a broad generalization that explains a body of facts or phenomena |
| quantity | something that has magnitude, size, or amount |
| SI | a single measurement system that has seven base units |
| weight | a measure of the gravitational pull on matter |
| derived units | combinations of SI base units |
| density | the ratio of mass to volume (dmv) |
| conversion factor | a ratio derived from the equality between two different units that can be used to convert from one unit to the other |
| accuracy | the closeness of measurements to the correct or accepted value of the quantity measured |
| precision | the closeness of a set of measurements of the same quantity made in the same way |
| percent error | calculated by subtracting the experimental value from the accepted value, dividing the difference by the accepted value, and x by 100 |
| significant figures | in a measurement consist of all the digits known with certainty plus one final digit, which is somewhat uncertain or estimated |
| scientific notation | numbers are written in the form Mx10(to the nth power) where M is a number greater than or equal to one, but less than ten and n is a whole number |
| directly proportional | two quantities are directly proportional to each other if dividing one by the other gives a constant value |
| inversely proportional | two quantities are inversely proportional to each other if their product is constant |
