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Absorbance of light by transparent samples.Krumbein scale for particle size in geology.Stellar magnitude scale for brightness of stars.The following are examples of commonly used logarithmic scales, where a larger quantity results in a lower (or negative) value: Particle size distribution curves of soil.The rule of nines used for rating low probabilities Entropy in thermodynamics.Counting f-stops for ratios of photographic exposure.Frequency level, with units cent, minor second, major second, and octave for the relative pitch of notes in music.
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Neper for amplitude, field and power quantities.Richter magnitude scale and moment magnitude scale (MMS) for strength of earthquakes and movement in the Earth.The following are examples of commonly used logarithmic scales, where a larger quantity results in a higher value: The markings on slide rules are arranged in a log scale for multiplying or dividing numbers by adding or subtracting lengths on the scales. Often exponential growth curves are displayed on a log scale, otherwise they would increase too quickly to fit within a small graph. Likewise, the numbers 2, 4, 8, 16, 32, and so on, would be equally spaced. In nonlinear scale, the numbers 1, 2, 3, 4, 5, and so on would not be equally spaced. As opposed to a linear number line in which every unit of distance corresponds to adding by the same amount, on a logarithmic scale, every unit of length corresponds to multiplying the previous value by the same amount. A logarithmic scale (or log scale) is a way of displaying numerical data over a very wide range of values in a compact way.