why 1 million liters of water is sprayed during the rocket launch?
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Rocket launches are very loud. As engine exhaust gasses exceed the speed of sound, they collide with the ambient air, and shockwaves are created, with noise levels approaching 200 dB. This energy can be reflected by the launch platform and pad surfaces, and could potentially cause damage to the launch vehicle, payload, crew, and even the nearby buildings. The heat generated from the rocket nozzle can also cause a fire in the nearby buildings.
Sites for launching large rockets are often equipped with a sound suppression system to absorb or deflect acoustic energy generated during a rocket launch. Sound is dissipated by huge volumes of water distributed across the launch pad and launch platform during liftoff. Water-based acoustic suppression systems are now common on launch pads. They aid not only in reducing acoustic energy but also protect nearby buildings from catching fire by injecting large quantities of water below the launch pad into the exhaust plume and in the area above the pad.
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