When we refer to the amplitude of sound as volume, we are using a metaphorical representation to describe the perceived loudness or intensity of the sound. The terms "volume" and "amplitude" are often used interchangeably in everyday language.
In physics, the amplitude of a sound wave refers to the maximum displacement of air particles caused by the wave's pressure variations. It represents the magnitude or strength of the sound wave. The greater the amplitude, the louder the sound is perceived to be.
While it's true that amplitude doesn't possess physical dimensions like length, width, or height, we use the term "volume" metaphorically to draw an analogy to physical objects that can occupy three-dimensional space. By relating sound intensity to the concept of volume, we can better convey the relative loudness of sounds to one another.
This metaphorical usage helps us communicate and understand sound characteristics more intuitively. It's important to remember that the terms we use to describe scientific concepts often employ metaphors and analogies to facilitate comprehension, even if they don't perfectly align with the physical properties of the phenomena they represent.