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# Volume, Weight

Wed 28 Jan, 2015 04:00 pm
A steel bar is 2 1/2 feet in length, 4 1/2 inches in width, and 1 1/2 inches in thickness. Determine volume and weight of bar.

Volume - 2.5 x .375 x .125 = .117 cu. ft.

Weight of cu. ft. of water - 62.5 lbs.

Weight of cu. ft. of steel - 62.5 x 7.85 (specific gravity of steel) = 490.625 lbs.

Weight of bar - 490.625 x .117 = 57.40 = 57 lbs.

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Type: Question • Score: 0 • Views: 926 • Replies: 5
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neologist

1
Thu 29 Jan, 2015 01:46 am
@Randy Dandy,
Looks OK here
Randy Dandy

1
Thu 29 Jan, 2015 08:56 am
@neologist,
Thanks.

I have a question - If the volume of any substance is known, can the weight be found by the specific gravity ?
contrex

1
Thu 29 Jan, 2015 01:04 pm
@Randy Dandy,
Randy Dandy wrote:
If the volume of any substance is known, can the weight be found by the specific gravity ?

Multiply the SG of the substance by the volume, then multiply the answer by the weight of the same volume of water (1 gramme per cubic centimetre, 1000 kg per cubic metre)

E.g specific gravity of steel commonly stated as 7.85

1 cubic metre of water weighs 1000 kg

thus 1 cubic metre of steel weighs (7.85 x 1000) kilogrammes

= 7850 kg

contrex

1
Thu 29 Jan, 2015 01:31 pm
@contrex,
contrex wrote:
Multiply the SG of the substance by the volume

This should be obvious, since the "specific gravity" of any substance is the factor by which that substance's density (mass per unit of volume) exceeds that of water. That is what "specific gravity" means.
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Randy Dandy

1
Thu 29 Jan, 2015 03:05 pm
Thanks.
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