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Ultimate Sound Pressure Level: Decibel Table
Ultimate Sound Pressure Level: Decibel Table
Ultimate Sound Pressure Level: Decibel Table copyright William Hamby 2004
Decibel's (dB) are units of ratio's and in this table are expressed in atmospheric decibels and in this table are Representative of the object (N), and not necessarily what the listener or sound level meter experiences (P).
(N) = Normalized total air power energy level sound plus any wind, watts or joules per second. These levels have been converted
(P) = Actual peak pressure meter readings. i.e. A force per unit area
(NP) = Normalized pressure used in explosive measurements, blast wind is not included
Decibel level (N = Normalized) (P = Actual pressure) (NP = Bomb pressure) cause or effect _______________________________
-30(N) One human talking 20 miles away
-4 to +4 (N) The ticking of an ordinary wrist watch at 1 meter
0 (N) Beginning of hearing, a mosquito 10 feet away, the ear drum moves less than 1 / 100
30 (P) Totally quiet night time in desert - impossible anywhere near city
40 A whisper, a normal conversation is 60 dB, Normal sound 70 dB
85 Beginning of hearing damage, ear plugs should be worn
93.98 (P) = 1 pascal pressure
100 Normal average car or house stereo at maximum volume
107 - 104 (P) The beginning of pain at the most sensitive frequency of 2750 Hertz
113.81 (P) 1 millimeter water
116 Human body begins to perceive vibration in the low frequencies
120-130 Front row at a rock concert
125 Drum set - only at the moment of striking, continuous level 115
128 (P) Human, loudest scream measured at a distance of 8 feet 2 inches
128 Human head hair begins to detect vibration
133 (N) Gunshot - Ear level, may vary greatly to size and type of gun
140 Extremely damaging to hearing no matter how short the time exposure
150 Rock concert speaker at 1600 watts on the actual vibrating surface
156.498 (P) 1 centimeter mercury
175 (N) Quarter dynamite stick, very close pressure may exceed 210 dB (P)
202 - 198 (P) Human death from sound (shock) wave alone
207 (N) Bomb, small sized 250 pounds, 14 foot wide crater
220 (N) Bomb, largest used in WWII, weighing 11 tons and 25 feet long
230.59 (NP) Earthquake Richter 4.0
248 (N) Atomic bomb - Hiroshima and Nagasaki Japan Aug. 6, 9, 1945. Tragically killed 300,000 people. Totally disintegrated 16 square miles, cracked distant concrete walls 12" thick, equal to 20,000 tons of T.N.T., wind was around 300 miles per hour, destroyed walls 28" thick at 1 mile. Power to make a crater 633 feet wide and 80 feet deeps
257 (N) Nuclear bomb, 1 mega ton (1 million tons of T.N.T.)
300 (N) Hurricane - Average, extreme energy is "diluted" by covering 500,000 square miles
310 (N) Krakatoa volcano eruption - 1883 A.D., cracked one foot thick concrete at 300 miles, created a 3000 foot tidal wave, heard 3100 miles away
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