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Most of the units in the International System are derived units, that is units defined in terms of base units and supplementary units.

Derived units can be divided into two groups—those that have a special name and symbol, and those that do not.

the measuring and recording of variations in fluid pressure, as blood pressure.2. the one and only actually great man in that whole British world; and yet there and then, just as in the remote England of my birth-time, the sheep-witted earl who could claim long descent from a king's leman, acquired at second-hand from the slums of London, was a better man than I was.

the measuring and recording of the angular oscillations of an aircraft in flight, with respect to an axis or axes flxed in space.

Isotopes are atoms with the same number of protons and electrons, but a different number of neutrons. These are the elements that we see around us and find in nature. Radioactivity is measured using a unit called the "curie". The curie measures how many atoms spontaneously decay each second.For example, the meter is defined as the distance traveled by light in a vacuum in 1/299,792,458 of a second.The standard for the kilogram is a platinum-iridium cylinder kept at the International Bureau of Weights and Standards in Sèvres, France.It finally ends up as a stable isotope as the element lead. Radiation can alter the structure of cells in our bodies causing mutations which can produce cancer.The more radiation a person is exposed to, the more dangerous it is. Despite the risks, there are a number of good ways that science has used radiation.For example, if a series of radiocarbon dates is taken from different levels in a given stratigraphic sequence, Bayesian ysis can help determine if some of the dates should be discarded as anomalies, and can use the information to improve the output probability distributions. Conventional lightwater fission reactors require enriched fuel.