Yes, there are other units of sound amplitude besides the decibel (dB). The decibel is commonly used to express the relative intensity or power of a sound wave compared to a reference level. However, there are alternative units that can be used to quantify sound amplitude in different contexts. Here are a few examples:
Pascal (Pa): The pascal is the SI unit of pressure, and it can be used to express the sound pressure level. Sound pressure level is a measure of the absolute sound pressure amplitude relative to a reference level of 20 micropascals (μPa). It is often used in acoustics and engineering applications.
Bel (B): The bel is a unit that expresses the ratio of two sound power levels or sound pressure levels. It is rarely used directly but is often used in combination with the decibel. One bel is equal to ten decibels.
Neper (Np): The neper is a unit that quantifies the natural logarithm of the ratio of two power levels or voltage levels. It is primarily used in electronics and signal processing applications, rather than in the field of acoustics.
It's important to note that these units are often used in combination with the decibel to express sound amplitudes more conveniently, as the decibel allows for a wide range of values to be expressed on a logarithmic scale.