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'''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 [[imperial]] units.
'''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 [[imperial]] units.
Another way of expressing density is '''specific gravity''', defined as the [[ratio]] of the density of the object to that of [[water]] at a given temperature. Specific gravity is thus [[dimensionless]]. Substances are denser than water if they have a specific gravity greater than 1, and less dense if it is less than 1. However, it does not follow that water has a specific gravity of 1, since the density of water varies according to the temperature. The use of specific gravity is generally discouraged in present-day scientific and technical writing, with absolute values of density preferred.
==References==
==References==
[[Category:Chemistry]]
[[Category:Chemistry]]
[[Category:Physics]]