Weight in Cubic Inches

[Guest]

A cu. in. of water weighs 0.036168 lbs. The specific gravity of steel is 7.83. Determine weight of a cu. in. and a cu. ft. of steel.

My attempt:

7.83 / 0.36168 = 21.64 lbs


A cu. ft. of water weighs 62.5 lbs.

7.83 / 62.5 = 0.12528 lbs.

Where am I correct ?

[Guest]

I think I have an error in my calculations:

0.036168 x 7.83 = 0.283 lbs. per cu. in.

62.5 x 7.83 = 489.375 = 489 lbs. per cu. ft.

Where am I correct ?