| Term | Definition |
| length | the distance from one point to another or how long something is |
| mass | the amount of matter in an object |
| units | measurements represented by numbers |
| variable | A factor that can change in an experiment |
| control | standard used for comparison of test results in an experiment |
| metric system | a system of measurement used by all scientists (based on the number 10) |
| meters | standard units of length |
| grams | standard units of mass |
| units of mass | milligram, gram, kilogram |
| units of length | millimeter, centimeter, meter, kilometer |
| tools of length | meter stick, ruler, trundle wheel, tape measure |
| tools of mass | triple beam balance, pan balance, spring scale |
| liters | standard units of volume |
| tools of volume | beaker and graduated cylinder |
| units of volume | milliliter, liter and kiloliter |
| multiply length x width x height | finding the volume of a regular object |
| volume displacement | finding the volume of an irregular object |