Black Powder Shock Wave

From Liveleak: Ultra slow motion footage of several thousand pounds of black powder exploding, showing very clearly the otherwise invisible shock wave.
spacemansays...

The explosion causes an increase in pressure that propagates outward and is inversely proportional with distance. Something called the index of refraction is increased due to the increase in pressure which bends and slows the light. This causes the "distortion" inside. The area around this is unaltered and thus appears normal.

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