what makes fireworks make the crackle sound?
413598
blackpowder or gunpowder exploding makes the cracle sound. they just put it in smaller sections so it wont be as loud
722599
The sound of someone having hot sex!
161386
Probably ultrasonic....
294611
I read somewhere that this "popping" is the escape of nitrogen gas. I'd have to try to remember where I read that, though, so I could provide the source.\n\n(EDIT: OK, the below link somewhat verifies what I read, and I'm starting to think I read the "nitrogen" thing here on "nswers" somewhere.)\n\n>>Your joints can make a variety of sounds: popping, cracking, grinding, and snapping. The joints that "crack" are the knuckles, knees, ankles, back, and neck. There are different reasons why these joints "sound off". \n\nEscaping gases: Scientists explain that synovial fluid present in your joints acts as a lubricant. The fluid contains the gases oxygen, nitrogen, and carbon dioxide. When you pop or crack a joint, you stretch the joint capsule. Gas is rapidly released, which forms bubbles. In order to crack the same knuckle again, you have to wait until the gases return to the synovial fluid. \nMovement of joints, tendons and ligaments: When a joint moves, the tendon’s position changes and moves slightly out of place. You may hear a snapping sound as the tendon returns to its original position. In addition, your ligaments may tighten as you move your joints. This commonly occurs in your knee or ankle, and can make a cracking sound. \nRough surfaces: Arthritic joints make sounds caused by the loss of smooth cartilage and the roughness of the joint surface.<<
53299
http://en.wikipedia.org/wiki/Noise_pollution\n\nNoise pollution is unwanted human-created sound that disrupts the environment. Noise pollution can be caused by many sources including highways, vehicles,police cars, ambulances, factories, concerts, music, air-conditioners, engines, machine, aircraft, helicopters, alarms, public address systems, industrial development and construction work. In general, noise pollution refers to any noise irritating to one's ear which comes from an external source. The word "noise" comes the Latin word "nausea" meaning seasickness.\n\n\nThis PIL was filed in the Hon'ble High Court of Delhi. The petition relates to the pollution caused by the crackers during the festivals like Diwali, Dusshera etc. The busting of crackers not only causes noise pollution but also air pollution besides heap of garbage is also accumulated in that day. Although authorities have been taking measures for controlling the pollution as directed by the Hon'ble High Court from time to time. Various meetings had also been conducted to get the relief. The standards for the fire crackers had been notified No.GSR 682(E), dated Oct.5, 1999. That the Hon'ble High Court of Delhi directed that: -\n\nNotification No.GSR 682(E), dated October 5,1999 shall be strictly complied with. \nFire crackers generating noise level exceeding 125 dB(01) of 145dB at 1 meters distance from the point bursting shall not be manufacture. \nFor individual fire cracker constituting the series (Joined fire crackers), the aforesaid limit shall be reduced by 51(N) dB, where N = number of crackers joined together. \nFrom 1st November,2000, the manufacturer shall specify and record the noise level on the cracker itself. \nUse of fire-works shall not be permitted on Dussehra, Diwali and other festivals including festivities except between 6.00 P.M to 11.00 P.M. \nFire-works shall not be used in the areas designated as silence zones. \nFire-works shall not be used near hospitals and nursing homes. \nPeople should be educated and made aware of the ill-effects air and noise pollution caused by the indiscriminate use of fireworks. For this purpose, Doordarshan and other TV channels should show quickies, on prime time, for at least five times a day. During the fortnight before Dussehra and Diwali, Directorate of Advertising and Visual Publicity. Ministry of Information and Broadcasting shall also give appropriate advertisements through newspapers. Besides All India Radio should broadcast appropriate messages on prime time on FM and other frequencies for circulation of the information in this regard. \nCPCB and CDP(Licensing) shall prepare slides/films fir showing adverse consequences of air and noise pollution and shall be shown/screened in all cinema halls of Delhi before all the daily shows. \nSteps should be taken by the managements of all schools in Delhi to educate students about the ill-effects of air and noise pollution. \nManufacture, Sale and use of rockets, maroons and atom bombs of a noise level higher than the one prescribed in Notification No.GSR 682(E), dated October 5,1999 shall not be permitted.
750877
When salts of different metals are burned, they produce different colors. So, fireworks use metals to produce different colors.
856862
because it may have pop up blocker, when it blocks pop up a click sound can be heard
110890
Fireworks utilize a rapid chemical reaction between a fuel and an oxidizer to release energy is the form of heat, light, and sound.\n\nGun powder is a common firework chemical.  Gun powder is made out of mixture of Sulfur, Charcoal, and Potassium Nitrate.  The Sulfur and Charcoal act as the fuel and the Potassium Nitrare acts as the Oxidizer.  When the power is ignited, the chemicals react together very quickly to produced to "explosive" results.
540824
giggle giggle giggle\n\nrofl
478556
Candlelight...or,better yet,crackling fireplace;)
885505
I assume you have heard thunder?\n\nThunder is a sonic shock wave caused by the rapid heating and expansion of the air surrounding and within a bolt of lightning. The bolt changes the air into plasma and it instantly explodes causing the sound known as a thunder clap.\n\nPerhaps you thought they were distinct events because we see lightning before we hear the associated thunder clap.  The reason is that light travels *much* faster (around 186,000 miles per *second*), while sound only travels around 1/5th of a mile in a second.\n\nYou'd be hard pressed to experience a bolt of lightning without the associated thunder unless you were too far away to hear it over other noises.
32539
use adobe photoshop or macromedia fireworks
2128
Its called a sound block.
246666
The answer to your question is the whip.  The end of a cracked whip can exceed speeds of Mach One.  The sound of a whip cracking is actually a mini sonic boom.
368621
A cheap convenient fuse is a sparkler, keep one end of the flammable material in contact with the firework fuse and just light the other end, you'll have a minute or so to get a better view. Hook up 2 or 3 if you want more time.
726542
Only if the sound can prevent Oxygen to the fire source.\n\nHowever, If the sound could cause turbulence in the air surrounding fire....Possible.\n\nMav.
789502
there are thousands of things that make noise but just how loud?from a cricket rubbing its legs together making a chirping sound to a B-52 bomber taxing down the runway and lifting off or maybe a Saturn 5 rocket lifting its cargo of the space shuttle and solid rocket boosters and liquid fuel cell?is it the least noisy or the most?if your in a fiefight and a 81 inch mortar round explodes next to you that may be the loudest sound you can ever heard plus the scariest.