Physics Help Forum Volume/volume and weight/weight persentages of the constituents in a composite

 Thermodynamics and Fluid Mechanics Thermodynamics and Fluid Mechanics Physics Help Forum

 Mar 10th 2009, 04:53 AM #1 Junior Member   Join Date: Mar 2009 Posts: 1 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.
 Mar 10th 2009, 10:41 AM #2 Senior Member   Join Date: Dec 2008 Location: Las Cruces NM Posts: 256 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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