noun (used with a singular verb)
the branch of physics dealing with physical objects that are not large enough to be observed and treated directly, as elementary particles, atoms, and molecules.

1880–85; micro- + physics

microphysical, adjective
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World English Dictionary
microphysics (ˌmaɪkrəʊˈfɪzɪks)
(functioning as singular) the branch of physics concerned with small objects and systems, such as atoms, molecules, nuclei, and elementary particles

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
There remains issues implementing microphysics into a nested configuration.
Study the interactions between warm cloud and ice microphysics at different stages of cloud development.
It represents an important advancement in ice microphysics in climate models.
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