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  1. Decibel - Wikipedia

    The decibel may be defined by the statement that two amounts of power differ by 1 decibel when they are in the ratio of 10 0.1 and any two amounts of power differ by N decibels when they are in the …

  2. What Are Decibels, and How Are They Measured? | HowStuffWorks

    Sep 7, 2023 · Decibels (abbreviated dB) are the units used to measure the relative intensity of a sound. The decibel unit of measurement is a little odd because the human ear is incredibly sensitive. The …

  3. Decibels (dB): The Only 5 Things You (Probably) Need to Know

    The decibel compares two numbers that differ by many digits and represents the ratio of those numbers with a smaller, simpler number. Decibels are especially useful when comparing numbers that vary by …

  4. Decibel (dB) | Definition, Formula, & Facts | Britannica

    Jan 21, 2026 · A decibel (dB) is a unit for expressing the ratio between two amounts of electric or acoustic power or for measuring the relative loudness of sounds.

  5. What is a decibel (dB)? - RapidTables.com

    Decibel (Symbol: dB) is a logarithmic unit that indicates ratio or gain. Decibel is used to indicate the level of acoustic waves and electronic signals. The logarithmic scale can describe very big or very small …

  6. How To Understand The Unit Of Decibels (Simple explanation)

    A decibel (dB) is a unit used to measure the intensity or power level of sound or signal. It represents the logarithmic ratio between the measured value and a reference value, typically the threshold of …

  7. Decibel - The Engineering ToolBox

    The decibel is a logarithmic unit used to describe the ratio of a signal level - like power, intensity or amplitude - to a reference level. Decibel is a dimensionless value of relative ratios. The signal units …

  8. DECIBEL Definition & Meaning - Merriam-Webster

    The unit for measuring the relative intensities of sound is called a decibel. Because the decibel scale is logarithmic, a sound with an intensity that is twice that of a reference sound corresponds to an …

  9. How is Sound Measured? - NIDCD

    Apr 28, 2025 · We measure sound intensity (also referred to as sound power or sound pressure) in units called decibels. Decibels (dB) are named in honor of Alexander Graham Bell, the inventor of both the …

  10. The decibel (dB) is used to measure sound level, but it is also widely used in electronics, signals and communication. The dB is a logarithmic unit used to describe a ratio.