In formula of porosity, there are 3 weights; Dry weight , wet weight and buoyant weight. What are these weight?
In formula of porosity is not weights - Only volumes!
p = (Vt-Vm)/Vt (- ) or
p = Ves/Vt (-)
where are:
p - porosity
Vt - total volume
Vm - volume of material (physical)
Ves - volume ov empty space (between sold particle of material)
Density and porosity of porous materials can be measured using the Archimedes buoyancy technique with dry weights, saturated weights and immersed weights in water. The meaning of different weights is illustrated in the reference: http://infohost.nmt.edu/~petro/faculty/Engler524/PET524-porosity-2-ppt.pdf
The choice of porosity measurement methods is dependent on the physical and diffuse properties of the bulk material. The colleagueGlodeanu listed some basic methods. In addition to these, there are still those that are based on Archimedes' law and the application of ideal gas law.
Knowing the value of bulk density and true density, also porosity can be calculated as follows:
Porosity = (True density - Bulk density/ True density * 100
There is a small error in the equation. Should:
(True density - Bulk density/ True density) * 100 (%)
I think that enough density (without true, because it is physical definition of density)
Thank you all for the question and the answers.
In measuring the porosity of a porous media using Archimedes' technique, is the degassing step necessary to eliminate the air bubble trapped in the pore space?
Porosity = [Theoretical density (calculated from the lattice constant)-bulk density based on Archimedes' law]/ Theoretical density (calculated from the lattice constant)
It is porosity of mechanical/crystal material. It is true formula. But porosity and density of bulk material are quasi properties which include volume between particles of bulk material.
Porosity =(Wt of wet memb-wt of dry memb)density of water/(Wt of wet memb-wt of dry memb)density of water+wt of dry memb x density of polymer. Then multiply with 100
wet memb-immerse 1cm2 memb in water or ethanol and wipe it then weigh it,
may be it will help you.
Thank you
P. K. Burnwal Can you please provide literature source for this porosity equation?
- The definition of porosity of bulk material is clear in the literature, and the measurement methods can be different.
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