Explications:
1) V = L × l × h
= 10 × 3 × 0.2
= 6 cm³
2) ρ = m/v
= 43/6
≈ 7.167 g/cm³
3) ρ ≈ 7.17 g/cm³ ≈ ρ (zinc)
d'où le métal est 'zinc'.