Question

what is the apparent in density when immersed in a fluid​

Answer 1

Apparent weight of body is the weight measured when the body is partially or fully immersed in a particular fluid. Apparent weight depends on density of fluid, acceleration due to gravity and immersion depth (Generally it is considered for fully immersed).

Answer 2

Archimedes' principle states that, when a body is partially or completely immersed in a fluid, it experiences an apparent loss in weight that is equal to the weight of the fluid displaced by the immersed part of the body.