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SBW (59-65)
Science
| Term | Definition |
|---|---|
| SI | A system of measurement based on multiples of ten and on established measures of mass, length, and time. |
| atomic number | Number of protons in the nucleus of an atom of a given element. |
| mass | The amount of matter in an object. |
| mass number | The sum of neutrons and protons in the nucleus of an atom. |
| weight | A measure of the force of gravity acting on an object. |
| isotope | Atoms of the same element that have different numbers of neutrons. |
| volume | The amount of space that matter occupies. |