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abstraction > mathematical concept > number > constant > fundamental physical constant > particle constant > particle mass > proton mass
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proton mass comparison table
Subject has uncertainty has value has symbol applies to particle is a kind of is an instance of
particle mass changes in value are due solely to an increase in measurement accuracy or convention  mass 
proton mass0.00000013 × 10-27 kg1.67262158 × 10-27 kgmpproton particle mass

Next particle masstau mass    Upparticle mass    Previous particle massneutron mass