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Home Q & A Board Science-Related Homework Help Physics
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miche37 miche37
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11 years ago
The specific gravity of a substance is the ratio of the mass of a substance to the mass of an equal volume of water.  What is the specific gravity of a substance whose density is 2.7 g/cm^3?  8 g/cm^3?  20 g/cm^3?  What is the relationship between the numerical values of the density in the CGS system and the specific gravity of a substance?

One problem that I have is that I don't know how to find the specific gravity for each density.  How do you do this?  Please show all your work and explain how you do this.
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#1
11 years ago
I hate the cgs system, it's more confusing than the imperial system. Using the SI system,,,

Specific gravity is the same as density, with a possible decimal multiplier.

Eg, density of water is about 1000 kg/m³ (actually 998). So the density of, for example, Al is 2700 kg/m³, so the SG is 2.7 (2700/1000)

Density of Fe is 7870 kg/m³, so SG is 7.87


So all you need is the density of water in whatever system you want to use, and divide the density by that to get SG.
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