别拿羽绒服当救生衣！冰面落水，这些科学自救法能保命

Core Viewpoint - The article discusses the misconception that down jackets can serve as life jackets, emphasizing that ordinary down jackets cannot replace professional rescue equipment [1][4]. Group 1: Experiment Findings - A recent test conducted by the Beijing Tongzhou District Fire Rescue Bureau demonstrated that while a down jacket can provide some initial buoyancy due to trapped air, it quickly becomes waterlogged and loses its floating ability [2][3]. - The experiment involved firefighters wearing down jackets and jumping into icy water, where they initially floated but soon became weighed down as the jackets absorbed water [2][3]. Group 2: Safety Recommendations - In the event of falling into icy water, individuals should use any nearby floating objects to stay afloat and call for help [5]. - Specific self-rescue techniques include keeping the head above water, calmly observing for thicker ice to escape, and crawling on the ice to avoid breaking it further [6][7]. - It is advised to avoid stepping onto dangerous ice surfaces and to seek professional rescue methods rather than attempting to save someone without proper equipment [8][9].