Density

Here:
0.03704 * 4.5 = 0.1668 lbs.

A brick weighs 4.5 lbs and its volume is 0.03704 cubic feet.

A simple cross calculation will give you the weight of a cubic feet:

1*4.5/0.03704 = 121.49 lbs




64 / 0.061024 = 1.048.76 cubic centimeters

Here too:
453.6 / 1048.76 = 0.43251 grams per cubic centimeter

453.6 gr is a pound but your brick weighs 4.5 lbs, so your brick weighs:

4.5*453.6 = 2041.16 gr

Its density is 2041.16/1048.76 = 1.95 gr/ cubic centimeter.

Thanks timur.