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Observer effect (physics) : ウィキペディア英語版 | Observer effect (physics)
In science, the term observer effect refers to changes that the act of observation will make on a phenomenon being observed. This is often the result of instruments that, by necessity, alter the state of what they measure in some manner. A commonplace example is checking the pressure in an automobile tire; this is difficult to do without letting out some of the air, thus changing the pressure. This effect can be observed in many domains of physics. The observer effect on a physical process can often be reduced to insignificance by using better instruments or observation techniques. Historically, the observer effect has been confused with the uncertainty principle. ==Particle physics== For an electron to become detectable, a photon must first interact with it, and this interaction will inevitably change the path of that electron. It is also possible for other, less direct means of measurement to affect the electron.
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