The dimensions of the brick are 250x120x65 mm. The brick mass is 3.6 kg. Find its density.

Initial data: a (brick length) = 250 mm; b (brick width) = 120 mm; c (brick thickness) = 65 mm; m (brick mass) = 3.6 kg.

SI system: a = 250 mm = 0.25 m; b = 120 mm = 0.12 m; s = 65 mm = 0.065 m.

1) Calculate the volume of the brick:

V = a * b * c = 0.25 * 0.12 * 0.065 = 0.00195 m ^ 3.

2) Find the density of the brick:

ρ = m / V = 3.6 / 0.00195 = 1846 kg / m ^ 3.

Answer: The required brick density is 1846 kg / m ^ 3.