FRANK FOX / SCIENCE PHOTO LIBRARY FRANK FOX / SCIENCE PHOTO LIBRARY
Water drop impact. High-speed photograph of secondary drop formation following the impact of a water droplet on water. The impact causes the surface of the pool to collapse, creating a rush of water inwards and upwards to form a column. Surface tension effects along the column cause a secondary drop to form. Shock waves radiate outwards as concentric circular ripples.
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