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# Acoustic Variables - The molecules, as they are squeezed together and separated, cause changes in the pressure within the medium. - Similarly, molecules undergoing compression and rarefaction show variations in **density**. - Density is defined as mass per unit volume. - **Distance** is defi...
# Acoustic Variables - The molecules, as they are squeezed together and separated, cause changes in the pressure within the medium. - Similarly, molecules undergoing compression and rarefaction show variations in **density**. - Density is defined as mass per unit volume. - **Distance** is defined as how far apart objects are, and it is the measurement of particle motion. - Distance may also be referred to as **vibration** or **displacement**.
