Mass and Density

Density is mass per volume-unit

ρ = m/V

  • m  mass in kg
  • V   volume in m3
  • ρ    density in kg m-3

Example  

Find the volume of 25 g gold.

ρ = 19.3 x 103 kg m-3     m = 25 g = 0.025 kg

ρ = m/V     19.3 x 103 = 0.025/V      (V) (19.3 x 103) = 0.025      V = 0.025/(19.3 x 103) = 1.30 x 10-6 m3=

1.30 cm3

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