Why NASA blasts half a million gallons of water during rocket launches

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This is the sound and protection against ignition overpressure.

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NASA's superession water deluge system

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Within 40 seconds, the water deluge system can send approximately 450000 gallons of water about 100 feet into the air.

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A rocket launch generates a large amount of acoustic energy,

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which could be enough to dam-age the extremely expensive onboard electronics.

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The water acts as a medium for sound waves and vibrations to travel through,

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lowering the acoustic level at launch sites to around 142 decibels.

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