Surface Tension 
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Surface tension can be calculated using 2 different models: Gradient theory, see reference: 23 Linear gradient theory, see reference: 22
Influence parameter The pure component influence parameter an be given by the use as a second order polynomial in temperature: IP = a + b*T + c*T^2 This was done to given the user the flexibility to match pure component data that often does not follower a line
Lij For the linear gradient theory the user can give a lij. The parameter is used in the mixing rule in the model and is similar to the kij used in most EOS.
