| − | An object's [[mass]] divided by the [[volume]] that the object occupies.<ref>Wile, Dr. Jay L. ''Exploring Creation With Chemistry''. Apologia Educational Ministries, Inc. 1998</ref> Unit of density is kg/m<sup>3</sup>.
| + | '''Density''' is the amount of [[mass]] an object has per unit [[volume]] that the object occupies.<ref>Wile, Dr. Jay L. ''Exploring Creation With Chemistry''. Apologia Educational Ministries, Inc. 1998</ref> The most common units of density include kg/L or kg/m<sup>3</sup> in [[metric]] units, and lb/gal or lb/ft<sup>3</sup> in engineering units. |