None. It is graphite not lead in a pencil.
How much graphite in a pencil? About 2/3 cubic inch (=6" x pi * (3/16)^2)
Divide 4.6 lbs by the lead density in lbs/cubic inch
244.5 (rounded)
There are 1,728 cubic inches in a cubic foot.
There are 1,728 cubic inches to the cubic foot
There are 1,728 cubic inches in a cubic foot.
According to my calculations, 2.44 in3 of lead would weigh one pound.
1728 cubic inches = 28316.8 cubic centimeters
2.81 cubic inches.
111.92 cubic inches.
That is 79.33 cubic inches.
About 0.061 cubic inches per cubic centimeter.
1 cubic foot = 1,728 cubic inches.