physics
US /ˈfɪz.ɪks/
UK /ˈfɪz.ɪks/

1.
natuurkunde
the branch of science concerned with the nature and properties of matter and energy. The subject matter of physics includes mechanics, heat, light and other radiation, sound, electricity, magnetism, and the structure of atoms.
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She is studying physics at university.
Ze studeert natuurkunde aan de universiteit.
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Quantum physics is a complex field.
Kwantumfysica is een complex vakgebied.