Loudness is the quality of a sound that is the primary psychological correlate of physical strength or amplitude. Loudness is a subjective felt impression and is in some way related to the objective measure of the sound pressure. Neither our ear drums nor the microphone diaphragms can convert acoustic intensity. Therefore only use the sound pressure for measuring. To measure the loudness feeling is a difficult thing.
If you are referring to loudness of sound, then 'decibel' is a way of describing the loudness of sound. Rise in 10 decibel should mean rise of about 10 folds the initial level.
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Well, you're thinking about "volume", but in music equipment, they are not the same. Volume describes how loud the equipment is. Loudness is a term that describes a process which makes the high notes and the very low notes louder at a low volume level.
The loudness or quietness of a sound is called its volume or intensity.
"Volume" is a term referring to how loud a sound is to humans and animals. Most entertainment devices that use sound have a "Volume Control", typically labelled, "Volume". Volume is not quite the same as "Loudness", by the way.
Loudness. Volume.
The amplitude is essentialy the volume (loudness).
The decibel.
It can be called dynamic level, loudness or volume. It is correlated with what is called the amplitude of the sound waves the musical instruments produce.
loudness, number of decibels, magnitude, amplitude, intensity, pitch
Volume
Units used to measure loudness are Sone (loudness N) and Phon (loudness level L). Scroll down to related links and look at "Loudness - Wikipedia" and "Sound level change and the change of the respective factor of volume and loudness"