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Sound Power
Sound Power Level and the Sound Power from some common sources as fans, jet engines, cars, humans and more ..
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Sound Power
Sound power is the energy rate - the energy of sound per unit of time (J/s, W in SI-units) from a sound source.
Sound Power Level
Sound power can more practically be expressed as a relation to the threshold of hearing - 10-12 W - in a logarithmic scale named Sound Power Level - Lw, expressed as
Lw = 10 log (N / No) (1)
where
Lw = Sound Power Level in Decibel (dB)
N = sound power (W)
No = 10-12 - reference sound power (W).
Human hearable Sound Power spans from 10-12 W to 10 - 100 W, a range of 10/10-12 = 1013.
The table below indicates the Sound Power and the Sound Power Level from some common sources.
| Source | Sound Power - N - (W) |
Sound Power Level - Lw - (dB) (re 10-12 W) |
|---|---|---|
| Saturn Rocket | 100,000,000 | 200 |
| Turbo Jet Plane Engine | 100,000 | 170 |
| 10,000 | 160 | |
| Inside jet engine test cell Jet Plane Take-off |
1,000 | 150 |
| Large centrifugal fan, 800.000 m3/h Turbo Propeller Plane at take-off |
100 | 140 |
| Axial fan, 100.000 m3/h Machine Gun Large Pipe Organ |
10 | 130 |
| Large chipping hammer Symphonic orchestra Jet Plane from passenger ramp Heavy Thunder Sonic Boom Small aircraft engine |
1 | 120 |
| Centrifugal van, 25.000 m3/h Accelerating Motorcycle Heavy Metal, Hard Rock Band Music Blaring radio Chain Saw Wood Working Shop Large air Compressor |
0.1 | 110 |
| Air chisel Subway Steel Wheels Magnetic drill press High pressure gas leak Banging of steel plate Drive gear Car at Highway Speed Normal Fan Vacuum Pump Banging Steel Plate Wood Planer Air Compressor Propeller Plane Outboard motor Loud street noise Power Lawn Mover Helicopter |
0.01 | 100 |
| Cut-off saw Hammer mill Small air compressor Grinder Heavy diesel vehicle Heavy city traffic Lawn mover Airplane Cabin at normal flight Kitchen Blender Spinning Machines Pneumatic Jackhammer |
0.001 | 90 |
| Alarm clock Dishwasher |
0.0001 | 80 |
| Toilet Flushing Printing Press Inside Railroad Car Noisy Office Inside Automobile Clothes Dryer Vacuum Cleaner |
0.00001 | 70 |
| Large department store Busy restaurant or canteen Ventilation Fan Noisy Home Average Office Hair Dryer |
0.000001 | 60 |
| Room with window air conditioner Office Air Diffuser Quiet Office Average Home Quit Street |
0.0000001 | 50 |
| Voice, low Small Electric Clock Private Office Quiet Home Refrigerator Bird Singing Ambient Wilderness Agricultural Land |
0.00000001 | 40 |
| Room in a quiet dwelling at midnight Quiet Conversation Broadcast Studio |
0.000000001 | 30 |
| Rustling leaves Empty Auditorium Whisper Watch Ticking Rural Ambient |
0.0000000001 | 20 |
| Human Breath | 0.00000000001 | 10 |
| 0.000000000001 | 0 |
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