| A | B | 
| Accuracy | Refers to the closeness of measurements to the correct or accepted value | 
| Conversion Factor | A ratio derived from the equality between two different units that can be used to convert form one unit to another. | 
| Density | The ratio of mass to volume | 
| Derived Unit | Combination of SI units form these | 
| Direct Proportion | the relation between quantities whose ratio remains constant, when A changes then B changes by the same factor; also called direct ratio | 
| Hypothesis | A testable statement | 
| Inverse Proportion | opposite in size, degree, or rate of development | 
| Model | In science is more than a a physical object it is often an explanation of how phenomena occur and how data or events are related | 
| Percent Error | The accuracy of an individuate measurement compared to the accepted value | 
| Precision | The closeness of a set of  measurement to each other | 
| Quantity | Is something that has magnitude , size or amount | 
| Scientific Method | A logical approach to solving problems by observing and collecting data formulating hypotheses, testing hypotheses, and formulating theories based on data | 
| Scientific Notation | Numbers are written in the form of M* 10n or M E n where the factor M is a number greater than or equal to 1 but  less than 10 | 
| SI | A single international system of measurements | 
| Significant Figure | In a measurement consists of all the digits known with certainty and one digit which is uncertain or estimated | 
| System | A specific portion of matter in a given region of space that has been selected for study during an experiment or observation | 
| Theory | A broad generalization that explains a body of facts or phenomena | 
| Volume | The amount of space occupied by an object | 
| Weight | A measure of the gravitational pull on matter |