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Logarithms are used to measure the “loudness” of sound. Decibels (dB) are logarithmic units used to describe a ratio of two levels of intensity or pressure. The difference between two levels of sound pressure ( and ) is defined as  dB. Usually, when decibels are used to describe just one sound, it is assumed that that sound is being compared to a reference level of micropascals (a measure of pressure).

  1. How many decibels correspond to doubling the pressure of a sound?

  2. What is the sound pressure of a noise described as dB?

  3. What does decibels mean?

    The sound ratio is .

  4. How many times more pressure is in a sound of dB than of dB?

    times more pressure.