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The chemicals are sometimes held for long periods of time in one place. This place is called a reservoir, which, for example, includes such things as coal deposits that are storing carbon for a long period of time. [23] When chemicals are held for only short periods of time, they are being held in exchange pools. Examples of exchange pools ...
In chemistry, chain propagation (sometimes just referred to as propagation) is a process in which a reactive intermediate is continuously regenerated during the course of a chemical chain reaction. For example, in the chlorination of methane , there is a two-step propagation cycle involving as chain carriers a chlorine atom and a methyl radical ...
Accordingly, carbon can remain in the lower mantle for long periods of time, but large concentrations of carbon frequently find their way back to the lithosphere. This process, called carbon outgassing, is the result of carbonated mantle undergoing decompression melting, as well as mantle plumes carrying carbon compounds up towards the crust. [99]
For example, the medical sciences refer to the biological half-life of drugs and other chemicals in the human body. The converse of half-life (in exponential growth) is doubling time. The original term, half-life period, dating to Ernest Rutherford's discovery of the principle in 1907, was shortened to half-life in the early 1950s. [1]
An example of the cubic crystals typical of the rock-salt structure [broken anchor]. Time-lapse of growth of a citric acid crystal. The video covers an area of 2.0 by 1.5 mm and was captured over 7.2 min. The interface between a crystal and its vapor can be molecularly sharp at temperatures well below the melting point.
Growth stocks: A growth stock is one that is expected to increase in value and beat the market, delivering higher-than-average returns over the long term. Growth stocks are typically from ...
Short-term goals. Long-term goals. Vacation. Retirement. Down payment for a car or house. Opening a business. Deposit for a new apartment. Paying for a child’s education
Short-term vs. long-term bonds: Key differences. If you’re new to investing in bonds, it’s important to understand the role short-term and long-term bonds can play in your portfolio.