What is the scientific definition of loudness?

Answer 1

Loudness is a subjective perception of each individual. Your neighbor's music is loud, but yours played at the same volume is not.

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Subjective - but hardly a scientific answer. Assuming both pieces are played at the same power output from identical equipment, their intensities and loudness will obviously be the same. "Loudness" is a function of the human hearing's frequency response, not a measure of how to annoy your neighbours.

Answer 2

That depends on the listening person. Music you like can be played much louder. Music you do not like has to be turned down. Scroll down to related links to find a table showing how loud specific noises are.

Answer 3

Loudness is the quality of a sound that is the primary psychological correlate of physical strength or amplitude. It is a subjective measure and is often confused with objective measure of sound pressure.

Answer 4

volume. It is subjective and each person defines it according to how they perceive high decibel noises.