Given: d = 2.70 g/cm³, the density M = 5.31 lbs, the mass t = 0.0130 mm, thickness
Convert all data into SI units. d = (2.70 g/cm³)*(1/1000 kg/g)*(10² cm/m)³ = 2.7 x 10³ kg/m³ M = (5.31 lb)*(0.543592 kg/lb) = 2.4086 kg t = (0.013 mm)*(10⁻³ m/mm) = 1.3 x 10⁻⁴ m
Let the surface area f the foil be A m². Then the mass of the foil is M = d*A*t = (2.7 x 10³ kg/m³)*(A m²)*(1.3 x 10⁻⁴ m) = 0.351A kg
Because the mass is 2.4086 kg, therefore A = 2.4086/0.351 = 6.862 m²
