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Old Mar 10th 2009, 05:53 AM   #1
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Volume/volume and weight/weight persentages of the constituents in a composite

Hi,

I have an aluminium/lead composite material with density of 8,3 g/m^3. How do I find volume/volume and weight/weight percentages of aluminium and lead in the material, if the masses of the composites are not given?

The volume of the material is also unknown.

Thanks.
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Old Mar 10th 2009, 11:41 AM   #2
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You must mean "g/cm^3".

Imagine a cubic centimeter of the composite. Let alpha be the part of the volume that is Aluminum. Let A be the density of Aluminum and P be the density of Lead.

(alpha)(A) + (1 - alpha)P = 8.3

Solve for alpha.

The ratio of aluminum to lead by weight is then ((alpha)A)/((1-alpha)P).
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