Airflow (orange), after a 1 m/s disc impact, becomes supersonic due to pinching water. Selected for an Editors' Suggestions and a Viewpoint in Physics.

From the article:

Supersonic Air Flow due to Solid-Liquid Impact
Stephan Gekle, Ivo R. Peters, José Manuel Gordillo, Devaraj van der Meer, and Detlef Lohse
Phys. Rev. Lett. 104, 024501 (2010)

View Issue Table of Contents