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    (Original post by rpotter)
    That is a very good question, but it is like asking what is mass. According to string theory charge is caused by stings vibrating in different ways, not much help i know, sorry
    The property of an object that resists a change in motion?

    Again although that is dictionary definition does it really tell you what mass truly means? I don't think you can really define mass, just measure it and say what it causes. By this method it could have lots of definitions, such as particle which interacts with the higgs boson (assuming its existence)
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