| Term | Definition |
| mass | the amount of matter in an object |
| volume | the space matter takes up |
| density | the amount of matter in a given space |
| density formula | density = mass/volume |
| volume of a box | length x width x height |
| water displacement | method used to measure the volume of irregular shaped objects |
| graduated cylinder | tool used for measuring volume of liquids |
| fluid | liquids and gasses; a material that can easily flow |
| weight | a measure on the force of gravity on an object |
| triple beam balance | tool used for measuring mass/weight of objects |
| Archimedes principle | equals the weight of the displaced liquid (in which an object is submerged in) |
| buoyant force | upward force on an object (fluid supplies the buoyant force) |