My Math Forum When a drop of water falls into water, where do the splashes come from?

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 January 3rd, 2015, 05:15 AM #1 Senior Member   Joined: Aug 2014 From: India Posts: 470 Thanks: 1 When a drop of water falls into water, where do the splashes come from? When a drop of water falls into a reservoir of water from a high enough altitude, water droplets will splash My question: Does the water in those droplets come from the original drop or from the reservoir?
 January 3rd, 2015, 05:49 AM #2 Math Team     Joined: Jul 2013 From: काठमाडौं, नेपाल Posts: 901 Thanks: 61 Math Focus: सामान्य गणित reservoir
 January 3rd, 2015, 06:47 AM #3 Math Team   Joined: Dec 2013 From: Colombia Posts: 7,683 Thanks: 2664 Math Focus: Mainly analysis and algebra When the drop enters the water it pushes water in the reservoir out of it's way (this action uses up the energy of the drop, causing it to slow down and stop). When the drop has passed it leaves air behind it (a slip-stream effect). The reservoir water bordering this slipstream then moves from all sides to fill in the gap. When the water from opposite sides meet in the middle it must dissipate the energy in the collision. It cannot move to the sides or down, because there is water already there, so it 'bounces' up instead. In your picture, one can see the original drop at the bottom of the disturbed water and the 'slipstream' above it.

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