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The particle skeletal density is the density of the material that constitute the particle, without porosity.
The Solid Skeletal density is to be measured by gas pycnometry thanks to a gas pycnometer (liquid pycnometry is not accurate)
Note : the method presented below is simplified, the objective being to present a concept, not to give an accurate method of calculation.
The volume of solids (excluding the pores), can be calculated thanks to
Equation 1 : deduction of volume of solid from pycnometry experiment
Figure 1 : Measuring skeletal density
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The skeletal density can be used to calculate the apparent particle density. It is for this purpose necessary to calculate the porosity of the particle ωp in m3/kg from the experience described above.