Chemistry

Chemistry is a physical science that studies the chemical elements that make up matter and compounds made of atoms, molecules and ions: their composition, structure, properties, behavior and the changes they undergo during reactions with other substances.

Effective cross section

The effective cross section is a physical quantity characterizing the probability of transition of a system of two interacting particles to a certain final state, a quantitative characteristic of the acts of collision of particles of a stream hitting a target with target particles. The effective cross-section has the dimension of the area.

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