CHEMP.5 Record for new chemicals

Hi everyone,

I am trying to add new chemicals in the CHEMP block but I have some difficulties with the CHEMP.5 record, i.e. about the ideal gas heat capacity constants.

I use the Properties of Gases and Liquids - Fifth Edition - Poling et al. (2001) but in this edition there 5 parameters (a0, a1, a2, a3 and a4) instead of four in the CHEMP.5 record.

I do not have the Fourth Edition of the Properties of Gases and Liquids from 1987.

Could anyone help me understand what is the link between the parameters from the Fourth to the Fifth Edition ?

Thank you very much in advance,

Quentin