Calculate the density of composite materials

AI Thread Summary
Calculating the density of a composite material requires more information than just the weight percentages of its components. In this discussion, a user seeks help with density calculations based on the weight percentages of aluminum (0.6%) and oxygen (0.4%), but the remaining 99% of the composition is unspecified. Without knowing the complete composition, including the identity and proportions of the other materials, it is impossible to accurately determine the density. The conversation highlights that even with a known composition, such as 100% carbon, the density can vary significantly depending on the material's structure (e.g., graphite vs. diamond). The complexity of predicting density increases with composite materials due to the various ways components can pack together, and phase diagrams for alloys illustrate this complexity. Overall, a complete understanding of the material's composition is essential for density calculations.
sasan98
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TL;DR Summary
Calculate the density of composite materials
Hello
Please help me. I'm not a chemistry student and I don't have a chemistry-related course, so please explain in a very simple way. Thank you.
I have a composite composition that I only have the weight percentage of atoms and I need to calculate the density so that I can check the properties of the material, for example, Al is 0.6%, O is 0.4%.
 
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sasan98 said:
TL;DR Summary: Calculate the density of composite materials

Hello
Please help me. I'm not a chemistry student and I don't have a chemistry-related course, so please explain in a very simple way. Thank you.
I have a composite composition that I only have the weight percentage of atoms and I need to calculate the density so that I can check the properties of the material, for example, Al is 0.6%, O is 0.4%.
If that is the only information you have, then there is not much you can calculate.

(For example, even if you know that your sample is 100% carbon, is it diamond or graphite?)
 
sasan98 said:
for example, Al is 0.6%, O is 0.4%.

What about remaining 99%?

(Not that it will help much - as @DrClaude already wrote, there is not enough information to proceed.)
 
To make what @DrClaude said explicit: The density of graphite is 2.26 g/cc. The density of diamond is 3.51 g/cc. Both graphite and diamond are 100% carbon. Composition is not enough to determine density.
 
Frabjous said:
To make what @DrClaude said explicit: The density of graphite is 2.26 g/cc. The density of diamond is 3.51 g/cc. Both graphite and diamond are 100% carbon. Composition is not enough to determine density.
Interestingly, it's probably easier to make some predictions about the density of composites as the number of ways the material is likely to pack is probably reduced. Still not enough information, though.
 
I don't think this is easy to predict - look at the phase diagram for alloys. Not at all simple. Heck, look at one for ice.
 
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