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Loudness is usually described in decibels, which is a logarithmic scale based on sound pressure level. If the threshold of hearing (for healthy ears) is taken as 2 x 10-5 Pascals, and this is called 0 db, then a fairly normal level such as you would find in a room in a house with the TV on is a sound pressure level 1000 times greater, ie 2 x 10-2 Pascals, and on the db scale this will be 60 db. Recommended maximum level for working is usually 90 db, above this ear defenders should be used.

See the Wikipedia article on 'Decibel'

(1 Pascal is 1 Newton per sq meter)

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