Modern Thermodynamics

- Chapter 1

29

Figure 1.7 Lennard-Jones "6-12" potential energy between two molecules as a function of the distance

between their centers. It is common to specify ε in units of K using the ratio (ε/kB) in which kB is the

Boltzmann constant. The assumed Lennard-Jones parameter values for the above curve are ε/kB= 197K

(which corresponds to εΝΑ=1.638kJ/mol) and σ=430pm. These values represent the approximate

interaction energy between CO2 molecules.