Thermodynamics
THERMODYNAMIC PROPERTIES
Specific Volume
The specific volume (n) of a substance is the total volume (V) of that substance divided by the
total mass (m) of that substance (volume per unit mass). It has units of cubic feet per
pound-mass (ft3/lbm).
(1-3)
n
V
m
where:
n
=
specific volume (ft3/lbm)
V
=
volume (ft3)
m
=
mass (lbm)
Density
The density ( ) of a substance is the total mass (m) of that substance divided by the total
r
volume (V) occupied by that substance (mass per unit volume). It has units of pound-mass per
cubic feet (lbm/ft3). The density ( ) of a substance is the reciprocal of its specific volume (n).
r
(1-4)
r
m
V
1
n
where:
=
density (lbm/ft3)
r
m
=
mass (lbm)
V
=
volume (ft3)
n
=
specific volume (ft3/lbm)
Rev. 0
Page 3
HT-01
