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At 08:39 PM 10/21/2005, you wrote:
Specific Heat (Cp) Density Specific Gravity Specific Heat (Cp) Temp. Pressure Temp. Pressure Density
Substance Chemical
Symbol Mol.
Weight ° F BTU/lb Air = 1 BTU/lb °F lb/cu. ft Water = 1 BTU/lb °F °F psia °F psia lb/cu ft
Air -- 28.98 -317.8 88.2 1 0.241 0.08018
from NIST RefProps program, I get:
Cp = 0.24064 BTU/lbm-F (constant pressure)
Cv=0.17170 BTU/lbm-F (constant volume)
Density = 0.072183 lbm/cuft
Multiply to get the units you are after.
The specific heat is, by devinition, per unit mass, not per unit volume.
Bill Dube'
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