One foot equal to 30.48 centimeter which means for cubic feet it will be: (30.48cm/ft)^3= 28316.8 cm^3/ft^3 Then, the weight of the iron would be: weight = volume * density weight = 1 ft^3 * (28316.8 cm^3/ft^3) * 7.87 g/cm3= 222853.216 grams = 222.9 kg
