https://wikimd.org/index.php?action=history&feed=atom&title=Relative_densityRelative density - Revision history2026-05-08T17:24:39ZRevision history for this page on the wikiMediaWiki 1.44.2https://wikimd.org/index.php?title=Relative_density&diff=5648171&oldid=prevPrab: CSV import2024-04-22T07:56:47Z<p>CSV import</p>
<p><b>New page</b></p><div>[[File:US_Navy_111005-N-ZN781-031_Aviation_Boatswain's_Mate_(Fuel)_3rd_Class_Rolando_Calilung_tests_for_a_specific_gravity_test_on_JP-5_fuel.jpg|US Navy 111005-N-ZN781-031 Aviation Boatswain's Mate (Fuel) 3rd Class Rolando Calilung tests for a specific gravity test on JP-5 fuel|thumb]] [[File:Hydro.PNG|Hydro|thumb|left]] [[File:PycnometerEmpty.jpg|PycnometerEmpty|thumb|left]] [[File:Pycnometer_full.jpg|Pycnometer full|thumb]] '''Relative Density''' (RD), also known as '''specific gravity''' (SG), is a measure of the density of a material compared to the density of a reference substance. Typically, the reference substance is water for liquids or solids, and air for gases. Relative density is a dimensionless quantity, as it is the ratio of either densities or weights.<br />
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==Definition==<br />
The relative density of a substance is calculated by the formula:<br />
\[ RD = \frac{\rho_{substance}}{\rho_{reference}} \]<br />
where \( \rho_{substance} \) is the density of the substance and \( \rho_{reference} \) is the density of the reference material (usually water for solids and liquids, and air for gases).<br />
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==Importance==<br />
Understanding the relative density of a material is crucial in various scientific and engineering fields. It helps in identifying substances, designing objects that float or sink in fluids, and in applications involving fluid dynamics and buoyancy.<br />
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==Measurement==<br />
The measurement of relative density can be performed using different methods, including the use of a [[Hydrometer]], a [[Pycnometer]], or an [[Archemedes' principle|Archimedes' principle]] based method. The choice of method depends on the accuracy required and the physical state of the substance.<br />
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==Applications==<br />
Relative density finds applications in various fields such as:<br />
* [[Chemistry]], for the identification of substances and determination of their purity.<br />
* [[Geology]], in determining the mineral composition of rocks.<br />
* [[Civil Engineering]], in soil testing and the design of mixtures for concrete.<br />
* [[Fluid Mechanics]], in understanding fluid flow and buoyancy.<br />
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==See Also==<br />
* [[Density]]<br />
* [[Buoyancy]]<br />
* [[Hydrometer]]<br />
* [[Pycnometer]]<br />
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[[Category:Physical quantities]]<br />
[[Category:Fluid dynamics]]<br />
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