Decibel.
The word "volume" represents the relative "loudness" of a sound. The word "decibel" is a unit of measurement for sound.
The word for the loudness of music is "volume" and the word for the slowness of music is "tempo."
Loudness. Volume.
The sone was proposed by Stanley Smith Stevens as a unit of perceived loudness in 1936. Loudness is the subjective perception of sound pressure. According to Stevens' definition, the sone is equivalent to 40 phons, which is defined as the loudness level of a 1 kHz tone at 40 dBSPL. The number of sones to a phon was chosen so that a doubling of the number of sones sounds to the human ear like a doubling of the loudness.
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Loudness.
Loudness is a word from psychoacoustics. It is the quality of a sound that is the primary psychological correlate of physical strength or amplitude. Loudness is a really subjective measure. It is often confused with objective measures of sound pressure or sound intensity. The perception of loudness varies from person to person, therefore it cannot be universally measured using any single metric. Loudness is also affected by parameters other than sound pressure, including frequency and duration. Scroll down to related links and look at "Dependance of sound levels and the corresponding factors - The subjectivly sensed loudness (volume)".
ugly, unit, upon
Joule is a unit of energy.
loudness
Loudness.
unit is what you measure by for example: cm, ft, in, mm, m, yd, etc.