by 
Max Power
ANSWERS: 4
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Decibels (specifically audio decibels - there are many different decibel scales measuring things other than audio) are a specific measurement of sound pressure. "volume" can mean several different things - the number on a volume dial, how loud something SEEMS to you at a particular time, etc. Decibels are precisely measured, so are a more exact measurement. For more (incredibly) detailed information on what decibels are, visit: http://www.phys.unsw.edu.au/~jw/dB.html
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some times decible are EXACT but not normally for example the standard for 0 db in recording is 4 db different than home audio
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Decibels are a measurement of wave pressure - decibles can be measured on sounds that are sub-sonic (that we cannot hear) and it is possible to have enough decibels to kill you in a sound range that you cannot hear. Volume therefore is a non-exact guide to sound within a certain hertz range.
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The term Decibel is very generic, it means basically the decadic logarithm of a ratio... (huh...???) Bear with me: if you have two signals, and one is a factor ten stronger than the other, you can say it is 10dB stronger. If it is factor hundred stronger it is 20dB, if it is factor hundred weaker, it is -20dB. Logarithm... This definition is used widely in electronics, microwave, radio, acoustics, but it doesn't bear a unit, it is just a ratio! There are special designations od decibels that HAVE a unit, e.g. dBm in radio/microwaves, which basically means milliwatts of power (http://en.wikipedia.org/wiki/DBm). And the acoustic dBA and dB SPL: http://en.wikipedia.org/wiki/A-weighted Sound pressure levels (SPL) given in dB refer to 20microPascal at 0dB, which is actually around the threshold level of hearing anything at all. One of these two may be the "Decibel level" you are inquiring about. "Volume" on the other hand is not a well-defined measure of anything acoustic.
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