# ChemistryData — where is specific gravity?

I cannot seem to find the basic chemical property specific gravity with ChemicalData or other comparable functions.

• Do chemists (and scientists in general) ever actually use specific gravity rather than density? – David Richerby Feb 12 '18 at 9:01

Specific gravity is not on the property list of curated chemical properties, so you can't get it directly. However, here is a function that will compute it.

With[{h2oDens = ChemicalData["Water", "Density"]},
specificGravity[name_String] := ChemicalData[name, "Density"]/h2oDens]

specificGravity["Ethanol"]


0.789

specificGravity["Gold"]


19.3

Another version, not that fast, but still for the record:

specificGravity[name_String]:=
WolframAlpha["specific gravity "<>name,
{{"SpecificGravityPod1:ChemicalData",1},"ComputableData"}]

specificGravity["gold"]


Out[]=19.3