The best replacement for specific gravity is density.

The best alternatives to specific gravity are rated as following:

★★★★★	density
★★	viscosity
★★	api gravity
★★	bulk density
★★	salinity
★	relative density
★	alcohol content
	specific volume
	brix
	specific weight
	original gravity
	plato
	vapor density
	concentration
	osmolality
	specific heat
	molecular weight
	baume
	ph
	percent solids
	concentration hcl

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Speaking about specific gravity, one probably shouldn't forget about density.

Other search terms related to specific gravity and their ratings are:

★★★★★	density
★★★★	urine
★★★	refractometer

You have in mind a companion for specific gravity and it is not yet here? Propose!

Google Trends

Scale is based on the average worldwide traffic of specific gravity in all years. Click on graph for more.

specific gravity

density

viscosity