Density of a 50 g stone that displaces 20 cm³

Answer: density = 2,500 kg/m³ (density 2.5 g/cm³).

What we know

Mass: 50 g = 0.05 kg (converted to the unit the formula takes)
Volume: 20 cm³ = 0.00002 m³ (converted to the unit the formula takes)

Step by step

Given: m = 0.05 kg, V = 0.00002 m³
Formula: ρ = m / V
Substitute: ρ = 0.05 / 0.00002
Result: ρ = 2,500 kg/m³

All results

Density	2,500 kg/m³
Density	2.5 g/cm³

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The physics

Density is how much mass is packed into a given volume: mass divided by volume. It is the property that decides whether something floats or sinks, feels heavy for its size, or drifts on the breeze. Two objects can be the same size yet wildly different in density — a kilogram of lead and a kilogram of feathers weigh the same but occupy completely different volumes.