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|Spanish to English translations [PRO]|
|Spanish term or phrase: peso específico|
This is the phrase most often used in the scientific literature.
Google hits for "specific gravity" = 171,000
Google hits for "specific weight" = 31,700
For example, see:
What is specific gravity?
I am trying to determine the specific gravity of polychlorinated biphenyl (PCB). The only information I have is the mass (or volume) of the compound and the molecular weight. What other information do I need to determine the specific gravity?
Specific gravity is the density of a substance relative to some reference substance:
Specific gravity = density of substance
density of reference substance
Specific gravity was defined because it's convenient to have a unitless measure of density. The reference substance for solids and liquids is usually water at 4°C. At that temperature, water has a density of 1.0000 g/mL. So if you know the density of a substance in g/mL, for most practical purposes that's numerically equal to the specific gravity.
To find the specific gravity of the PCB, then, you'll need to have the mass (in g) of a given volume (in mL) of PCB.
Author: Fred Senese firstname.lastname@example.org
Specific gravity is a measure of the density of a mineral. At times it is such a useful property that it is the only way to distinguish some minerals without laboratory or optical techniques. Gold (pictured) can easily be distinguished from "fool's gold" by specific gravity alone, although there are many other ways. Specific gravity is a unitless measure, because it is derived from the density of the mineral divided by the density of water and thus all units cancel. However, since water's density equals 1 gram per cubic centimeter (at specific conditions), then a mineral's specific gravity would also correspond to a mineral's density as expressed in grams per cubic centimeter.
Specific gravity, or SG, as already stated compares the density of a mineral to the density of water. If a mineral has a SG of 2, then it is twice as dense as water. If a mineral has a SG of 3 then it is three times as dense as water and so forth. However, comparing a mineral to water is not practical and is not really helpful. It is easier to consider what is the SG of a typical mineral and compare minerals that way.
Selected response from:
DR. RICHARD BAVRY
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