# How to quantify a hydrogen bond

### Background

After we found three different ways to define hydrogen (or any!)
bonds, it would be helpful if we could tell something about the
strength of these bonds.

It is well known, that there is a relationship between the shortest
and second shortest O-H bond. A picture about this relationship
is shown below:

** Shortest versus second shortest O-H distance **

The bond valence model described in the next chapter
will provide a simple model to quantify this relationship, while
the use of the geometrical coordination will prove useful to minimize
the scatter quantifying hydrogen bonds

Last Updated: 26 October 1996