# How much space does a Pound of copper use

1. Mar 5, 2012

### John1397

I am trying to figure out if you have one pound of copper density 8.95 and if you have a pound of silver density 10.4 how much space each will take or how much more space the copper will take this can be ounce's or whatever metric measurement they use for volume
as I put a pound of copper in water then took out the copper and put a pound of silver in the water and I came up with about three to four nickels (5 cents) worth of volume difference and I was going to figure out if this is about the right amount of volume? Will 8.95 divided by 10.4
which is .86 be an indicator as if you had a cubic foot of copper that with silver it would only be .86th of a cubic foot of silver or does it not work that way?

John

2. Mar 5, 2012

### mathman

You have the right idea.

3. Mar 5, 2012

### cmb

Best not to work in pounds, but refer to kilogrammes.

A pound of copper is heavier than a pound of silver.

Confusing, huh!?

A pound of silver = 373.24 g
A pound of copper = 453.59 g

4. Mar 5, 2012

### John1397

I kinda worked it out starting with the weight of a pound of copper and silver in one cubic foot then taking 7.48 gallons in a cubic foot times 128 ounces in gallon and I come up with 1 pound of silver taking up 1.47 ounces of space and for copper taking up 1.74 ounces of space, if you could physically pour copper and silver I hope this is right.

John

5. Mar 6, 2012

### mathman

Where did you get this idea? Are you assuming Troy weight for silver and Avoirdupois for copper?

6. Mar 7, 2012

### John1397

I am trying to figure how much the thickness of 1 pound of silver would be in 3.5" diameter the formula goes as follows:

diameter 3.50"
X
X
pie 3.14
=
sq. Inches 9.6162

cubic inches
in sq. foot 1728

divided by 9.66162
=
179.6938 < cylinder 3.5" diameter should be this many inches long

Pound of silver
per cu. foot 660

divided by 179.6938
=
per inch 3.6729 pounds

divided by 4
=
per quarter in. .918225 pounds

Here is my problem as I know that 3.5 inch diameter 1/4 inch weighs .918225 pounds
how much thickness in decimal format is needed to make 1 pound?

John

7. Mar 7, 2012

### cmb

Of course. What other measurement system would you use for silver with 'pounds' in it, other than Troy?

8. Mar 7, 2012

### mathman

I suspect that the original question assumed the same unit of weight for both copper and silver.

9. Mar 7, 2012

### Gordianus

The OP seems to revolve around Archimede's principle; a fine idea.
Most of the replies show how the imperial/american system of units revolve around lots of awful conversion factors; a terrible fact.