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abstraction > mathematical concept > number > constant > fundamental physical constant > particle constant > particle mass > tau mass
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tau 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 
tau mass0.00052 × 10-27 kg3.16788 × 10-27 kgmτtau particle mass

Next particle massalpha particle mass    Upparticle mass    Previous particle massproton mass