relativa e non assoluta

English translation: (The decibel is a) relative unit, not an absolute one.

GLOSSARY ENTRY (DERIVED FROM QUESTION BELOW)
Italian term or phrase:relativa e non assoluta
English translation:(The decibel is a) relative unit, not an absolute one.
Entered by: Franco Rigoni

06:41 May 21, 2016
Italian to English translations [PRO]
Physics
Italian term or phrase: relativa e non assoluta
Decibel è un’unità di misura relativa e non assoluta. Se 15dB è la soglia teorica di udibilità umana, verso gli 80 dB il suono raggiunge un tale spessore da indurre fastidio; vicino ai 120 dB inizia la sensazione di dolore.
Franco Rigoni
Italy
(The decibel is a) relative unit, not an absolute one.
Explanation:
See the link below, end of first paragraph after the formula.
Selected response from:

silvia rossetti
Italy
Local time: 11:03
Grading comment
Grazie
4 KudoZ points were awarded for this answer



Summary of answers provided
5 +3(The decibel is a) relative unit, not an absolute one.
silvia rossetti


  

Answers


14 mins   confidence: Answerer confidence 5/5 peer agreement (net): +3
(The decibel is a) relative unit, not an absolute one.


Explanation:
See the link below, end of first paragraph after the formula.


    Reference: http://www.dosits.org/science/advancedtopics/decibel/
silvia rossetti
Italy
Local time: 11:03
Specializes in field
Native speaker of: Native in ItalianItalian
PRO pts in category: 4
Grading comment
Grazie

Peer comments on this answer (and responses from the answerer)
agree  James (Jim) Davis: As a one time student of experimental psychology who has measured decibels in terms of JNDs I can confirm. It is a subjective measurement. Psychology rather than physics.
2 hrs
  -> Thank you James

agree  Peter Cox
2 days 5 hrs
  -> Thank you Peter

agree  Andres Diaz: I agree. To be more precise, I would not say that it is a relative unit but that it is a relative measurement. The unit is not what is relative to other units, but the values measured are relative ratios. I studied this in both psychology and physics.
2 days 15 hrs
  -> Good observation, as for example in Sound Pressure Levels you have 10 times the logarithm of a square pressure ratio. However dB is the unit conventionally associated to Sound Pressure/Sound Power Levels ...(I used to work in Acoustics). Thank you!!
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