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In physics, "particle density" refers to the number of particles within a specific unit of volume, not the density of a single particle. This is distinct from the general concept of density, which is defined as mass per unit volume (d = M/V). Particle density is typically denoted by the symbol n.12

Particle physics, also known as high-energy physics, is a branch of physics that studies the fundamental constituents of matter and their interactions, often using particle accelerators.3

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