First of all, the chain is composed of multiple segments. In the long-term wearing process, each segment will become slightly longer due to wear, resulting in a significant increase in length.
Secondly, the purity of the whip chain is very high, and it also has a certain expansion coefficient, which may cause slight expansion when worn, and also cause the chain to become longer.
Please note that the whip chain mentioned above is suitable for some expensive chains with fine workmanship, and this principle may not be applicable to some chains made of ordinary materials. If in doubt, please consult professionals in related fields.