A relation for a dimensionless variable called the compressibility (z), which is used to describe the pressure-volume-temperature behavior for real gases, is
z = 1 + Bρ + Cρ2 + Dρ3
where ρ is the density in g mol/cm3. What are the units of B, C, and D?
Convert the coefficients in the equation for z so that the density can be introduced into the equation in the units of lbm/ft3 thus:
z = 1 + B* ρ* + C* (ρ*)2 + D* (ρ*)3
ρ* is in lbm/ft3. Give the units for B*, C*, and D*, and give the equations that relate B* to B, C* to C, and D* to D.
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