The common logarithm is the logarithm with base 10. It is also known as the decadic logarithm and also as the decimal logarithm, named after its base, or Briggsian logarithm, after Henry Briggs, an English mathematician who pioneered its use. It is indicated by log10(x), or sometimes Log(x) with a capital L (however, this notation is ambiguous since it can also mean the complex natural logarithmic multi-valued function). On calculators it is usually "log", but mathematicians usually mean natural logarithm rather than common logarithm when they write "log". To mitigate this ambiguity the ISO specification is that log10(x) should be lg (x) and loge(x) should be ln (x).
... Scientific quantities are often expressed as logarithms of other quantities, using a logarithmic scale ... It is based on the common logarithm of ratios — 10 times the common logarithm of a power ratio or 20 times the common logarithm of a voltage ratio ... the quality of sound and image compression methods using the logarithm ...
... The numerical value for logarithm to the base 10 can be calculated with the following identity as procedures exist for determining the numerical value for logarithm base e and ... Natural logarithm#Numerical value Algorithms for computing binary logarithms ...
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