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Atheist
Atheist is offline
#6
Sep5-04, 08:30 AM
P: 39
Masses given for particles are the masses of free particles. When particles bond together the created particle can have a lower mass than the sum of the constituents (to some extend one can even see this as the reason why stable bound states exist). The mass-difference is called the bonding energy.

@ArmoSkater: You seem to have mistaken my 1st post.