Editing Relative density (section)

==Examples==
{| class="wikitable sortable"
|-
! Material !! Specific gravity
|-
| [[Balsa wood]] || 0.2
|-
| [[Oak]] wood || 0.75
|-
| [[Ethanol]] || 0.78
|-
|[[Olive oil]] || 0.91
|-
| [[Water]] || 1
|-
|[[Olea capensis|Ironwood]] || 1.5
|-
|[[Graphite]] || 1.9–2.3
|-
| [[Table salt]] || 2.17
|-
| [[Aluminium]] || 2.7
|-
| [[Cement]] || 3.15
|-
| [[Iron]] || 7.87
|-
| [[Copper]] || 8.96
|-
| [[Lead]] || 11.35
|-
| [[Mercury (element)|Mercury]] || 13.56
|-
| [[Depleted uranium]] || 19.1
|-
| [[Gold]] || 19.3
|-
| [[Osmium]] || 22.59
|}

(Samples may vary, and these figures are approximate.)

Substances with a relative density of 1 are neutrally buoyant, those with RD greater than one are denser than water, and so (ignoring [[surface tension]] effects) will sink in it, and those with an RD of less than one are less dense than water, and so will float.

Example:
<math display="block">RD_\mathrm{H_2O} = \frac{\rho_\mathrm{Material}}{\rho_\mathrm{H_2O}} = RD,</math>

[[Helium]] gas has a density of 0.164&nbsp;g/L;<ref name="UCSB">{{cite web|title=Lecture Demonstrations|website=physics.ucsb.edu| url=http://web.physics.ucsb.edu/~lecturedemonstrations/Composer/Pages/36.39.html}}</ref> it is 0.139 times as dense as [[air]], which has a density of 1.18&nbsp;g/L.<ref name="UCSB"/>

*[[Urine]] normally has a specific gravity between 1.003 and 1.030. The Urine Specific Gravity diagnostic test is used to evaluate renal concentration ability for assessment of the urinary system.<ref name=":0">{{Cite book|title=Medical-surgical nursing : assessment and management of clinical problems|last1=Lewis|first1=Sharon Mantik|last2=Dirksen|first2=Shannon Ruff| last3=Heitkemper|first3=Margaret M.|last4=Bucher|first4=Linda|last5=Harding|first5=Mariann|date=5 December 2013| isbn=978-0-323-10089-2|edition=9th|location=St. Louis, Missouri|oclc=228373703}}</ref> Low concentration may indicate [[diabetes insipidus]], while high concentration may indicate [[albuminuria]] or [[glycosuria]].<ref name=":0" />
*[[Blood]] normally has a specific gravity of approximately 1.060.<ref>{{cite web | url=https://hypertextbook.com/facts/2004/MichaelShmukler.shtml | title=Density of blood | first=Michael | last=Shmukler | year=2004 | website=The Physics Factbook | editor-last=Elert | editor-first=Glenn | accessdate=2022-01-23 }}</ref>
*[[Vodka]] 80° proof (40% v/v) has a specific gravity of 0.9498.<ref name="Cocktail Specific Gravities">{{Cite web |title=Good Cocktails - Specific Gravity of Liquor and Liqueurs |url=http://www.goodcocktails.com/bartending/specific_gravity.php |archive-url=http://web.archive.org/web/20230604075151/https://www.goodcocktails.com/bartending/specific_gravity.php |archive-date=2023-06-04 |access-date=2025-04-09 |website=www.goodcocktails.com |language=en}}</ref>