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Understanding the decibel scale involves acknowledging the logarithmic nature of the scale. In essence, the decibel scale allows us to comprehend and compare the vast range of sound intensities our ears can detect, from the quietest whisper to the roar of a jet engine. This scale is a convenient tool because it can represent very large or small values in a manageable format.įor instance, our human ears can perceive sounds that range over twelve orders of magnitude in pressure changes – a task daunting to comprehend if we didn’t have the decibel scale. The decibel scale is a logarithmic scale used to quantify the intensity of a sound or the power level of an electrical signal by comparing it to a given level on a logarithmic scale. In the case of decibels, the logarithmic scale allows us to represent the vast range of human hearing, from the quietest whisper to the roar of a jet engine, in a compact and manageable way. This type of scale is extremely useful when the values to be plotted cover a large range. Unlike the linear scale, where equal distances reflect equal changes in quantity, a logarithmic scale shows that equal distances reflect equal ratios of change rather than equal differences in quantities. What Is A Logarithmic Scale?īefore answering what the decibel scale is, it is important to understand what a logarithmic scale is.Ī logarithmic scale, often just referred to as a log scale, is a way of displaying numerical data over a very wide range of values in a compact way. In the realm of sound, this reference level is typically the standard threshold of hearing for the average human ear, often denoted as 0 dB. Being a relative unit of measure, decibels compare the level of an observed quantity to a reference level. The prefix ‘deci-‘ denotes a tenth part, making a decibel one-tenth of a bel. The term ‘decibel’ is derived from ‘bel,’ named in honour of Alexander Graham Bell, a prominent inventor and scientist known for his work in telecommunication. Decibels, often abbreviated as dB, are a logarithmic unit of measurement used to express the ratio of two values of a physical quantity, most commonly in acoustics for sound.
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