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Derived variables and calculated process variables Table 4-15:
Derived Variable
Description
Calculated process variables
Density at
reference
tempera-
ture
Standard
volume
flow rate
Specific
gravity
Concen-
tration
Net mass
flow rate
Net vol-
ume flow
rate
Density at reference
temperature
Mass/unit volume, cor-
rected to a given refer-
ence temperature
✓ ✓
Specific gravity
The ratio of the density
of a process fluid at a
given temperature to
the density of water at
a given temperature.
The two given temper-
ature conditions do not
need to be the same.
✓ ✓ ✓
Mass concentration
derived from refer-
ence density
The percent mass of
solute or of material in
suspension in the total
solution, derived from
reference density
✓ ✓ ✓ ✓
Mass concentration
derived from specif-
ic gravity
The percent mass of
solute or of material in
suspension in the total
solution, derived from
specific gravity
✓ ✓ ✓ ✓ ✓
Volume concentra-
tion derived from
reference density
The percent volume of
solute or of material in
suspension in the total
solution, derived from
reference density
✓ ✓ ✓ ✓
Volume concentra-
tion derived from
specific gravity
The percent volume of
solute or of material in
suspension in the total
solution, derived from
specific gravity
✓ ✓ ✓ ✓ ✓
Concentration de-
rived from reference
density
The mass, volume,
weight, or number of
moles of solute or of
material in suspension
in proportion to the to-
tal solution, derived
from reference density
✓ ✓ ✓
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