So what are decibels? To answer that, let us first look at sound pressure. Sound is measured by changes in air pressure. The louder a sound is, the larger the change in air pressure is. The change here is the change from normal atmospheric pressure to the pressure disturbance made by the sound. This change in pressure can be measured by handheld devices or computers with special microphones. Sound pressure is usually measured in pascals, which is an SI metric unit.

A pascal symbol Pa is equal to a force of one newton per square meter. For instance, a tire pressure of 35 pounds per square inch is equal to about , pascals, or about kilopascals. The smallest sound pressure a human ear can hear is 20 micropascals 0.

Writing this is scientific notation is convenient: 2. Remember this number — we will use this later as a reference. All musical material is re-recorded and does not use in any form the original music or original vocals or any feature of the original recording. Without expressed permission, all uses other than home and private use are forbidden.

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