Calculating The Sample Volume, Density, And Specific Volume - Micromeritics 1305 Operator's Manual

Calculating the Sample Volume, Density, and Specific Volume

Calculating the Sample Volume, Density, and Specific Volume
The general equation for computing the sample volume is
where
V
SAMP
V
CELL
V
EXP
P
1
P
2
Each range has its values for V
tion sheet for the instrument. Numerical suffixes are added to each to identify the
range to which they pertain; for example, V
on the 35-cm
A sample data sheet to help facilitate computations is included in Appendix B. A
detailed derivation of the equation is found in Appendix A. The computer pro-
gram in Appendix C may be used to automate sample computation.
Density is defined as the weight per unit volume and will usually be computed as
where
ρ
SAMP
W
SAMP
V
SAMP
3-14
V
= V −
V
⁄ P
SAMP CELL
P
1
= the sample volume to be found,
= the empty volume of the sample cell with the empty sample cup
in place,
= the expansion volume added when the PREP/TEST valve is
in the TEST position,
= the charge pressure (recorded in Step 18 of Performing an
Analysis, and
= the pressure after expansion (recorded in Step 19 of Performing
an Analysis.
3
range.
Gross Weight − Cup Weight
W
ρ = SAMP =
SAMP
V
SAMP
= sample density,
= sample weight, and
= sample volume.
Model 1305 MultiVolume Pycnometer
EXP
− 1
2
and V ; these are provided on the calibra-
CELL EXP
is the expansion volume used
EXP35
V
SAMP
Jun 99