Xiaogang took an aluminum ball with a weight of 8 N and a volume of 0.9 cubic decimeter and submerged it in the water. The buoyancy of the aluminum ball was much greater

Xiaogang took an aluminum ball with a weight of 8 N and a volume of 0.9 cubic decimeter and submerged it in the water. The buoyancy of the aluminum ball was much greater

8 Newton
Because the aluminum ball at this time is hollow, it will float on the surface of the liquid, so gravity and welfare are equal, equal to 8 Newtons

The density of substance A is 2.5t/m3, that of substance B is 2.5kg/dm3, that of substance C is 2.5g/cm3 and that of substance D is 250kg / m3, among which ()
A. A b b c c c d

The density of a material: ρ a = 2.5t / m3 = 2.5 T / m3 = 2.5 × 103kg / m3 = 2.5 × 103kg / m3, the density of B material: ρ B = 2.5 kg / dm3 = 2.5 kg / dm3 = 2.5 kg / dm3 = 2.5 kg / dm3 = 2.5 kg / dm3 = 2.5 kg / dm3 = 2.5 kg / dm3 = 2.5 kg, 1 DM3 = 10-3 = 10-3m3 = 10-3m3 = 10-3m3 = 10-3m3 = 10-3m3, the density of C material: ρ propylene = 2.5 g / cm3 = 2.5g / cm3 = 2.5g / cm3 = 2.5t / cm3 = 2.5 × 10-3 = 2.5 × 10-3 = 2.5 × 10-3 = 2.5 × 10-3 = 2.5 × 10-3 = 2.5 × 10-3-3-3-3 a So the density of D is the smallest

Density: the third power of 2.5t/m, the third power of 2.5kg/dm, the third power of 2.5g/cm, the third power of 250kg / m, which is the smallest and which is the biggest reason
The third power of 2.5t/m the third power of 2.5kg/dm the third power of 2.5g/cm the third power of 250kg / M which is the smallest and which is the biggest reason for the density of the object

5 t / M = 2 500 kg / m, 2.5 kg / DM = 2 500 kg / m, 2.5 g / cm = 2 500 kg / m, so 4 is the smallest and the rest is the same