Editing Relative density (section)

===Limitations===
Specific gravity (SG) is a useful concept but has several limitations. One major issue is its sensitivity to temperature since the density of both the substance being measured and the reference changes with temperature, affecting accuracy.<ref>{{cite journal |last=Shaw |first=P.E. |year=1916 |title=The newtonian constant of gravitation as affected by temperature |journal=Philosophical Transactions of the Royal Society of London |volume=216 |issue=538–548 |pages=349–392 |doi=10.1098/rsta.1916.0007|doi-access=free |bibcode=1916RSPTA.216..349S }}</ref> It also assumes materials are incompressible, which isn't true for gasses or some liquids under varying pressures.<ref>{{cite book |title=Engineering Design Handbook:Hydraulic Fluids |publisher=US Army Materiel Command |year=1971 |chapter=Chapter 3-Specific Gravity |page=3-38 |chapter-url=https://books.google.com/books?id=2gVTWYmMuZwC&dq=Specific+gravity+sensitive+to+temperature&pg=RA2-SA3-PA38 |access-date=Sep 15, 2024}}</ref> It doesn't provide detailed information about a material’s composition or properties beyond density.<ref>{{cite web |url=https://www.samaterials.com/specific-gravity-liquids-gases-and-solids.html |title=Specific Gravity: Liquids, Gases, and Solids |website=Stanford Advanced Materials |last=Trento |first=Chin |date=Jan 5, 2024 |access-date=Sep 15, 2024}}</ref> Errors can also occur due to impurities, incomplete mixing, or air [[Bubble (physics)|bubbles]] in liquids, which can skew results.<ref>{{cite patent |country=WO |number=1992005422A1 |status=patent}}</ref>