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Chemistry and physics are branches of science that both study matter. The difference between the two lies in their scope and approach. Chemists and physicists are trained differently, and they have different professional roles, even when working in a team. The division between chemistry and physics becomes diffuse at the interface of the two branches, notably in fields such as physical chemistry, chemical physics, quantum mechanics, nuclear physics/chemistry, material science, spectroscopy, solid state physics, crystallography, and nanotechnology. == Scope == Physics and chemistry may overlap when the system under study involves matter commonly encountered on earth, composed of electrons and nuclei made of protons and neutrons. On the other hand, chemistry is not concerned with other forms of matter such as quarks, mu and tau leptons and dark matter, which do not participate in the transformation of one kind of substance into another, and which we do not observe under typical terrestrial conditions. Although fundamental laws that govern the behavior of matter apply both in chemistry and physics, the disciplines of physics and chemistry are distinct. Physics is concerned with nature from a very large scale (the entire universe) down to a very small scale (subatomic particles). All natural (or man-made) phenomena that are measurable follow some behavior that is in accordance with the most basic principles studied in physics.〔〔 Physics is involved with the fundamental principles of physical phenomena and the basic forces of nature, and also gives insight into the aspects of space and time. Physics also deals with the basic principles that explain matter and energy, and may study aspects of atomic matter by following concepts derived from the most fundamental principles. Chemistry focuses on how substances interact with each other and with energy (for example heat and light).〔〔 The study of change of matter (chemical reactions) and synthesis lies at the heart of chemistry, and gives rise to concepts such as organic functional groups and rate laws for chemical reactions. Chemistry also studies the properties of matter at a larger scale (for example, astrochemistry) and the reactions of matter at a larger scale (for example, technical chemistry), but typically, explanations and predictions are related back to the underlying atomic structure, giving more emphasis on the methods for the identification of molecules and their mechanisms of transformation than any other science. Chemistry is not a sub-discipline of physics because chemistry differs from physics in aspects such as approach, emphasis (scope) and training of its practitioners. The knowledge obtained from studying either chemistry or physics can be used in a more direct way (as an applied science) or can be used to further our understanding of some aspect of nature. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Comparison of chemistry and physics」の詳細全文を読む スポンサード リンク
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