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* In [[geometry]] the logarithm is used to form the [[metric space|metric]] for the [[hyperbolic motion#Elementary half-plane geometry|half-plane model]] of [[hyperbolic geometry]].
* Many types of engineering and scientific data are typically graphed on [[log-log]] or [[semilog]] axes, in order to most clearly show the form of the data.
* [[Interval (music)|Musical intervals]] are measured logarithmically as [[semitone]]s. The interval between two notes in semitones is the base-2<sup>1/12</sup> logarithm of the frequency ratio (or equivalently, 12 times the base-2 logarithm). Fractional semitones are used for non-equal temperaments. Especially to measure deviations from the equal tempered scale, intervals are also expressed in [[cent (music)|cents]] (hundredths of an equally-tempered [[semitone]]). The interval between two notes in cents is the base-2<sup>1/1200</sup> logarithm of the frequency ratio (or 1200 times the base-2 logarithm). In [[MIDI]], notes are numbered on the semitone scale (logarithmic absolute nominal pitch with middle C at 60). For microtuning to other tuning systems, a logarithmic scale is defined filling in the ranges between the semitones of the equal tempered scale in a compatible way. This scale corresponds to the note numbers for whole semitones. (see [https://web.archive.org/web/20080212074520/http://www.midi.org/about-midi/tuning.shtml microtuning in MIDI]).
 
== सन्दर्भ ==
== बाहरी कड़ियाँ ==
* [http://www.maximintegrated.com/en/app-notes/index.mvp/id/3611Integrated DC Logarithmic Amplifiers]
* [https://web.archive.org/web/20080423111204/http://www.mathlogarithms.com/ Explaining Logarithms]
* [https://web.archive.org/web/20080430194051/http://mathworld.wolfram.com/Logarithm.html Logarithm] on [[MathWorld]]
* [https://web.archive.org/web/20080304115529/http://www.micheloud.com/FXMfxm/LOG/index.htm Jost Burgi, Swiss Inventor of Logarithms]
* [https://web.archive.org/web/20070927005900/http://www.algebra.com/algebra/homework/logarithm/ Logarithm calculators and word problems with work shown, for school students]
* [https://web.archive.org/web/20070627125949/http://www.johnnapier.com/table_of_logarithms_001.htm Translation of Napier's work on logarithms]
* [https://web.archive.org/web/20070705203019/http://www.tufts.edu/~gdallal%7Egdallal/logs.htm Logarithms - from The Little Handbook of Statistical Practice]
* [https://web.archive.org/web/20080722101443/http://en.literateprograms.org/Logarithm_Function_%28Python%29(Python) Algorithm for determining Log values for any base]
 
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