Intermolecular distance - what does it mean

What is the distance (in kilometers) between the Polish and German populations, or what does the distance between two buses mean Because of the non-zero dimensions of both objects, it is difficult to teU what the distance could be and any measure of it will be arbitrary. It is the same story with molecules. Up till now we did not need a notion for the intermolecular distance, the positions of the nuclei were sufficient. At the beginning we need only an infinite distance and therefore any definition will be aeceptable. Later, however, we will be forced to spedly the intermolecular distance (cf. p. 698 and Appendix X on p. 1038). The final numerical values should not depend on this choice, but intermediate results could depend on it. It will turn out that despite the existing arbitrariness, we will prefer those definitions which are based upon the charge barycentre distance or similar. 

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