Volatility (chemistry) Volatility (chemistry) In chemistry and physics, volatility is quantified by the tendency of a substance to vaporize. Volatility is directly related to a substance's vapor pressure. At a given temperature, a substance with higher vapor pressure vaporizes more readily than a substance with a lower vapor pressure. The term is primarily written to be applied to liquids; however, it may be used to describe the process of sublimation which is associated with solid substances, such as dry ice (solid carbon dioxide) and osmium tetroxide (OsO), which can change directly from the solid state to a vapor, without becoming liquid. The
Principle (chemistry) Principle (chemistry) Principles - historical concept of the constituents of a substance, specifically those that produce a certain quality or effect in the substance, such as a "bitter principle", which is any one of the numerous compounds having a bitter taste. The idea of chemical principles developed out of the classical elements. Paracelsus identified the "tria prima" as principles in his approach to medicine. Georg Ernst Stahl published "Philosophical Principles of Universal Chemistry" in 1730 as an early effort to distinguish between mixtures and compounds. He writes, "the "simple" are "Principles", or the first material causes of "Mixts";..." To define