Specific gravity of corundum is between 3.95-4.01.
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On earth the gravity of a ruby is 9.81 m/s^2
If you mean the specific gravity of ruby:
3.97 - 4.05
Aluminum has no specific gravity, at least by the current definition of gravity.
specific gravity of fly ash is 3.2
Specific gravity doesn't have units. It's the density relative to water, so specific gravity is effectively just a number.
"Specific gravity" or "specific density"
Every substance has a specific gravity. Aluminum's is around 2.6 .