Encyclopedia
Vortex
Vortex: Atmospheric formation with rotational movement of air around a vertical or inclined axis
Source: "SAFETY IN EMERGENCY SITUATIONS. NATURAL EMERGENCY SITUATIONS. TERMS AND DEFINITIONS. GOST 22.0.03-97/GOST R 22.0.03-95"
(approved by the Decree of the Russian State Standard dated May 25, 1995 No. 267)