Other Change Units
Change in a quantity can also be expressed logarithmically using the unit of logarithmic change: the neper (Np). Normalization with a factor of 100, as done for percent, yields the derived unit centineper (cNp) which aligns with the definition for percentage change for very small changes:
But using cNp has two additional advantages. First, there is no need to keep track of which of the two quantities, V1 or V2, the change is expressed relative to, since, under the conditions of the approximation, the two quantities are nearly the same. Second, an X cNp change in a quantity following a -X cNp change returns that quantity to its original value. For example, if a quantity doubles, this corresponds to a 69cNp change (an increase). When it halves again, it is a -69cNp change (a decrease.)
Read more about this topic: Relative Change And Difference
Famous quotes containing the words change and/or units:
“A fanatic is one who can’t change his mind and won’t change the subject.”
—Winston Churchill (1874–1965)
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—Willa Cather (1873–1947)