Question

Which one settles faster - the one with higher or lower specific gravity?

Answer 1

The one with higher specific gravity

Answer 2

Specific gravity = density of substance / density of water ( 1000 kg /m³) 

so density of substance should be greater than density of water 

so that specific gravity will be more .. and higher specific gravity means higher density which means it will settle beneath water molecules .. so the substance which have high specific gravity will settle faster .