Which type of flare ignites when exposed to oxygen?

The M211 flare is specifically designed to ignite in the presence of oxygen. This characteristic is fundamental to its function, as flares rely on combustion to produce light and signal for various purposes, including search and rescue operations. When the M211 is exposed to oxygen, it initiates a reaction that leads to an intense flame, making it effective for signaling even in low-visibility conditions.

In contrast, other flares may have different ignition mechanisms or may not be designed to depend solely on the presence of oxygen, which is why they do not fulfill this specific requirement. Understanding the materials and chemical compositions used in different flare types is essential for safety and efficacy in their applications.