Jisho

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(物質科学)
Wikipedia definition
1. Cluster (physics)In physics, the term clusters denotes small, multiatom particles. As a rule of thumb, any particle of somewhere between 3 and 3x10 atoms is considered a cluster. Two-atom particles are sometimes considered clusters as well. The term can also refer to the organization of protons and neutrons within an atomic nucleus, e.g. the Alpha particle, consisting of two protons and two neutrons (as in a helium nucleus).
Read “Cluster (physics)” on English Wikipedia
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