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Ionization, in chemistry and physics, any process by which electrically neutral atoms or molecules are converted to electrically charged atoms or molecules (ions). Ionization is one of the principal ways that radiation, such as charged particles and X rays, transfers its energy to matter. In Kinetic theory of gases relates the macroscopic property of the gas, like – Temperature, Pressure, Volume to the microscopic property of the gas, like – speed, momentum, position. In this model, the atoms and molecules are continually in random motion, constantly colliding one another and the walls of the container within which the gas is ... Ancient usage. The English word theory derives from a technical term in philosophy in Ancient Greek.As an everyday word, theoria, θεωρία, meant "looking at, viewing, beholding", but in more technical contexts it came to refer to contemplative or speculative understandings of natural things, such as those of natural philosophers, as opposed to more practical ways of knowing things, like ...