3.5 centimeters is how many pounds

According to the mass conversion unit one centimeter is equal to 0.0000625 pounds. One centimeter is equal to 0.03125 grams and one gram is equal to 0.002 pounds, so 3.5 centimeters = 3.5 centimeters = 3 x 0.0000625 + 0.5 x 0.0000625 = 0.00021875 pounds