I've been wondering why tension is measured in lb's. And how this is calculated. Lb's are a unit of weight, yet stringing at a higher tension doesn't give me the impression that the strings/racket feel heavier, especially by >10kg. Say I string a racket @ 24lb, this is equal to roughly 11kg. What is "significant" of this added 'weight' to my racket? I do seem confused, but I hope the OP makes it clear what I want to know. Thanks in advance.