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In quantum mechanics, for systems where the total number of particles may not be preserved, the number operator is the observable that counts the number of particles. The following is in bra–ket notation : The number operator acts on Fock space .
Parton, is a generic term coined by Feynman for the sub-particles making up a composite particle – at that time a baryon – hence, it originally referred to what are now called "quarks" and "gluons". Odderon, a particle composed of an odd number of gluons, detected in 2021.
In thermodynamics, the particle number (symbol N) of a thermodynamic system is the number of constituent particles in that system. [1] The particle number is a fundamental thermodynamic property which is conjugate to the chemical potential. Unlike most physical quantities, the particle number is a dimensionless quantity, specifically a ...
In principle, multiplicative quantum numbers can be defined for any abelian group. An example would be to trade the electric charge, Q, (related to the abelian group U(1) of electromagnetism), for the new quantum number exp(2iπ Q). Then this becomes a multiplicative quantum number by virtue of the charge being an additive quantum number.
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Printable version; In other projects Wikidata item; ... Boron 5 B 10.81: Carbon 6 C ... Template:Periodic table legend ...
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