Circular movement about an axis, for a 3-dimensional object, or a point for a 2-dimensional object.
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Where one or more substances are changed into different substances.
An electrically neutral group of two or more atoms held together by covalent bonds.
The angle made between a reflected ray and a line perpendicular to the surface at the point of reflection.
The process in which a photon is emitted from an atom or molecule when hit by another photon of the right energy.
The maintenance of a stable internal environment.