Density = (mass) / (volume) = 27/10 = 2.7 gm/cm3 .
Power density refers to the amount of power per unit volume.
the density of water is 1.0g/cm to the 3rd power or 1.0g cubic centimeters
25/1000 = 0.025 gram per cubic cm
The formula for mass if density is not given is mass=volume/power
Density = Mass/VOlume = 120g/200cm3 = 0.6 grams per cm3
I regret that the question cannot be answered since it is not possible to have a "volume of 4 x 10 to the 4th power centimeters". Volume is not measured in centimetres.
The substance's density is 0.11 g/cm3
The density of the diamond is 3.52 g/cm3
Reduction in power density. Power density is the power produced by the engine per volume unit. Reduced volumetric efficiency means that less air/fuel will be delivered to the engine for a specific engine volume.