1. Definition of skeletal density

The particle skeletal density is the density of the material that constitute the particle, without porosity.

For other density definitions, please refer to : bulk density or particle density

2. Measurement of skeletal density

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

3. Application of skeletal density

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 ω_p in m³/kg from the experience described above.