why would specific gravity be easier to test than density ?

Answer 1

In part, specific gravity can be measured with a hydrometer. You establish a range that the liquid displaces and let it bob until it comes to equalibrium. This test can be measured at any temperature.

However, mass density is done in a container that is kept at a constant temprature. The math is easy once the measurments are taken, but there is more time involved in setting up the test and bringing the whole thing to equalibrum

Answer 2

It wouldn't. In order to find the specific gravity of a substance the density must be known.

Answer 3

Because Gravity, one can test by dropping something and doing math

while density has to do with the measurements (hard with irregular shapes) and different units.

Answer 4

if you mean compare the weight and volume can be considered density,
the gravity can be get by measure weight.

so that is it