Question

what is relative density what is its SI unit​

Answer 1

$\large\bold\purple{Heya\:Meta\:!!}$

||It is defined as the ratio of density of the substance to density of water at 4 degree Celsius it has no unit because it is a ratio||

Answer 2

hlo mate ✌️

Relative density :

the ratio of the density of a substance to the density of a standard, usually water for a liquid or solid, and air for a gas.

S.I --> Unitless , no unit

Hope it helps ❣️