Which type of noise is characterized by a constant volume without interruption?

The characteristic of noise being described as having a constant volume without interruption aligns with continuous noise. This type of noise remains steady over time and does not display fluctuations or breaks in its sound level. Examples of continuous noise include the sound of a running motor, a fan, or white noise.

In contrast, intermittent noise consists of sounds that start and stop at irregular intervals, such as the sound of machinery that operates in cycles. Impulse noise is characterized by short bursts of sound, usually at a higher intensity, like a gunshot or a clap of thunder. Impact noise involves sounds created from physical impacts, such as footsteps on a hard floor or objects dropping. Continuous noise is specifically defined by its unchanging volume, which distinguishes it from these other types of noise.