Algebra by Coolmath.com: Hundreds of Algebra Lessons, Algebra 1, Algebra 2 and Precalculus Algebra

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Decibel Levels:

(The following is a table of common everyday sounds along with sounds common in music. The red
numbers are the sound levels measured in decibels. Wherever possible, I have included the
distance at which the sound level is being measured.)

	160
Jet engine - close up
	150	Snare drums played hard at 6 inches away Trumpet peaks at 5 inches away
	140	Rock singer screaming in microphone (lips on mic)
Threshold of pain
	130
Pnuematic (jack) hammer		Cymbal crash
Planes on airport runway	120
		Fender guitar amplifier, full volume at 10 inches away
Power tools	110
Subway (not the sandwich shop)	100
	90
Heavy truck traffic
	80	Typical home stereo listening level Acoustic guitar, played with finger at 1 foot away
Average factory
	70
Busy street		Small orchestra
	60	Conversational speech at 1 foot away
Average office noise	50
Quiet conversation	40
Quiet office	30
Quiet living room	20
	10	Quiet recording studio
	0	Threshold of hearing for healthy youths

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