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	coderedcomputing	2010-11-22 , 15:49
	Posts: 152 \| Thanked: 53 times \| Joined on Dec 2009 @ West Virginia	#59

Define "no noise"

Source of sound Sound pressure Sound pressure level
Sound in air pascal RMS dB re 20 μPa
Very calm room 2×10−4 – 6.32×10−4 Pa 20 – 30 dB

Very good link that was already posted in this thread:
https://secure.wikimedia.org/wikiped...ressure_levels

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