How to do 1.42 g/cm² to mg/mm²
1g = 1,000mg1cm = 10mm ⇒ 1cm² = (10mm)² = 100mm²therefore1.42 g/cm² = 1.52 · 1,000/100 mg/mm² = 1.52 · 10 mg/mm² = 15.2 mg/mm²