There is an incompatibility in your question. A theoretical value is calculated. A measured value is measured. So, to calculate the theoretical value for the density you can use XRD and a little research (e.g. on ResearchGate) will turn up the applicable equation. If you want to measure the true density use a gas pycnometer. Other densities (e.g. bulk, apparent, and tapped) represent something else.
'Relative density' - what do you mean? Do you mean relative to water? If so, then this is specific gravity and not density.
If you refer to powder compacts sintering process, the relative density (in %) is the ratio between apparent density (mass per unit volume taking into consideration any voids) and the theoretical density.
Dear all,
though there was a disagreement, BET can be used to determine the density. Regards
Hello Abdelkader Please let us know the assumptions in calculating a density from BET. It's normally assumed in order to convert an absorption from (for example) m2/cm3 to m2/g.
Hello Amjad. You have calculated the theoretical density via XRD. (2.6g/cm3 or 2600 kg/m3 as is the correct SI unit...). As you say, the real density (you say apparent - I consider tapped and bulk density to be 'apparent') can be measured by a gas pycnometer (yes, Archimedes' Principle).
Dear Professor Alan F Rawle;
following an attached document on the use of BET for density calculation. I have another document and a book which also show how to use BET for density caculation. The book is very volumenous to be attached but I can give its details. Regards
Hello Abdelkader Thank you for the attachment. This is simply using a BET apparatus as a gas pycnometer to measure density. It's not using the BET equation to measure density.
Dear all;
this question was already discussed years ago. Here is the link within RG and an additional document I have posted. Regards
https://www.researchgate.net/post/How_does_the_true_density_of_a_porous_material_such_as_activated_carbon_calculate/2
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