Mercury porosimetry, as performed by the AutoPore, is primarily intended to measure the total volume of pores within a sample between an upper and lower limit of pore sizes with a 1% accuracy level. In addition to porosity, mercury porosimetry is also often used to measure the bulk density and the skeletal density.
Relative to mercury porosimetry, bulk density is defined as the unit weight per unit volume (usually grams per cubic centimeter) of a material after the volume of the largest open pores (larger than a specific size) has been subtracted. A typical value for the largest pore included in the bulk density is 180 micrometers (µm). Skeletal density is usually computed after the volume of all pores larger than about 0.005 µm has been excluded from the volume presumed occupied by the material.
It is obvious that the mercury porosimeter does not measure density directly, but instead is primarily a volume-measuring instrument. The conversion to densities requires that the operator provide the necessary weights to complete the computation. An understanding of the bulk density and skeletal density computations will be much easier if the concept of the mercury porosimeter as a volume-measuring device is kept in mind.
Mercury porosimetry, as performed by the AutoPore, is primarily intended to measure the total volume of pores within a sample between an upper and lower limit of pore sizes with a 1% accuracy level. In addition to porosity, mercury porosimetry is also often used to measure the bulk density and the skeletal density.
Relative to mercury porosimetry, bulk density is defined as the unit weight per unit volume (usually grams per cubic centimeter) of a material after the volume of the largest open pores (larger than a specific size) has been subtracted. A typical value for the largest pore included in the bulk density is 180 micrometers (µm). Skeletal density is usually computed after the volume of all pores larger than about 0.005 µm has been excluded from the volume presumed occupied by the material.
It is obvious that the mercury porosimeter does not measure density directly, but instead is primarily a volume-measuring instrument. The conversion to densities requires that the operator provide the necessary weights to complete the computation. An understanding of the bulk density and skeletal density computations will be much easier if the concept of the mercury porosimeter as a volume-measuring device is kept in mind.
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