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  2. Decade (log scale) - Wikipedia

    en.wikipedia.org/wiki/Decade_(log_scale)

    One decade (symbol dec [1]) is a unit for measuring ratios on a logarithmic scale, with one decade corresponding to a ratio of 10 between two numbers. [ 2 ] Example: Scientific notation

  3. Logarithmic scale - Wikipedia

    en.wikipedia.org/wiki/Logarithmic_scale

    A logarithmic unit is a unit that can be used to express a quantity (physical or mathematical) on a logarithmic scale, that is, as being proportional to the value of a logarithm function applied to the ratio of the quantity and a reference quantity of the same type. The choice of unit generally indicates the type of quantity and the base of the ...

  4. Unit of time - Wikipedia

    en.wikipedia.org/wiki/Unit_of_time

    cosmological decade: logarithmic (varies) 10 times the length of the previous cosmological decade, with CD 1 beginning either 10 seconds or 10 years after the Big Bang, depending on the definition. eon: 10 9 yr: Also refers to an indefinite period of time, otherwise is 1 000 000 000 years. kalpa: 4.32 × 10 9 yr: Used in Hindu mythology. About ...

  5. Logarithmic timeline - Wikipedia

    en.wikipedia.org/wiki/Logarithmic_timeline

    A logarithmic timeline is a timeline laid out according to a logarithmic scale. This necessarily implies a zero point and an infinity point, neither of which can be displayed. The most natural zero point is the Big Bang, looking forward, but the most common is the ever-changing present, looking backward. (Also possible is a zero point in the ...

  6. Level (logarithmic quantity) - Wikipedia

    en.wikipedia.org/wiki/Level_(logarithmic_quantity)

    The logarithmic frequency ratio (also known as frequency level) of two frequencies is the logarithm of their ratio, and may be expressed using the unit octave (symbol: oct) corresponding to the ratio 2 or the unit decade (symbol: dec) corresponding to the ratio 10: [7]

  7. Category:Logarithmic scales of measurement - Wikipedia

    en.wikipedia.org/wiki/Category:Logarithmic...

    Category for units of measurement or physical quantities in a logarithmic scale. Subcategories. This category has the following 2 subcategories, out of 2 total. E.

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  9. History of logarithms - Wikipedia

    en.wikipedia.org/wiki/History_of_logarithms

    In 1722, Warner introduced the two- and three-decade scales, and in 1755 Everard included an inverted scale; a slide rule containing all of these scales is usually known as a "polyphase" rule. In 1815, Peter Mark Roget invented the log log slide rule, which included a scale displaying the logarithm of the logarithm. This allowed the user to ...