| Term | Definition |
| controlled experiment | when only one variable is changed |
| prediction | and educated guess |
| hypothesis | an explanation for a phenomenon used as the basis for further investigation |
| variable | something that changes in an experiment |
| triple beam balance | a long object used to measure mass |
| caliper | measures lengths and internal or external diameters |
| ruler | used for drawing lines, measuring and more (inches, centimeters) |
| overflow container | a container that is used to measure the volume of an irregular solid |
| graduated cylinder | used for water displacement |
| beaker | a large circular glass to measure liquid volume |
| precision | exactness (people are precise; tools are accurate) |
| accuracy | correctness or quality of being true |
| meniscus | the curve in a liquid at the side of a container. You use it to find the liquid volume. |
| mass | how much matter there is in something |
| interpolation | guessing where a point would be within a set of data |
| independent variable | result from dependent variables |
| dependent variables | independent variables result from them |