What is the smallest segment that a string can be broken into?

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Clarification of Question by noaks-ga on 26 Jul 2006 18:38 PDT

By "strings" I mean the ones refered to in string theory.

I guess by smallest you mean shortest.
In theory you can segment until the length of each molecule (or polymer).
However, much before reaching molecular dimensions, a string will
cease to be a string as we define in normal sense of the word. It will
become a speck of cotton or polyester or whatever it's made of.

noaks,

   Are you refering to strings as in string theory? Or do you mean
something more generic?

One Planck length (1.6 × 10^-35 meters)