Fuel-air Explosive -

A small primary charge bursts the container, aerosolizing the fuel (liquid or solid particles) into a massive cloud that mixes with the surrounding air.

Fuel-air explosives (FAE), commonly known as or "vacuum bombs," are specialized munitions that use atmospheric oxygen to create a high-temperature, long-duration explosion. Unlike conventional explosives that carry their own oxidizer, FAEs consist almost entirely of fuel, allowing them to release up to 400% more energy than an equivalent weight of TNT. Mechanism of Action fuel-air explosive

Once the cloud reaches an optimal concentration—often between 186–275 g/m³ for common fuels—a second charge detonates the mixture. A small primary charge bursts the container, aerosolizing

FAEs typically operate through a "two-stage" detonation process: Mechanism of Action Once the cloud reaches an

This creates a that lasts significantly longer than conventional "point-source" explosions, making it far more destructive to structures and unarmored personnel. Performance vs. Conventional Explosives Fuel-Air Explosive (FAE) Conventional (TNT) Energy Source Uses atmospheric oxygen Carries internal oxidizer Energy Release 7.9–11.3 kcal/g (Propylene Oxide/Decane) 1.1 kcal/g Blast Profile Slower, sustained pressure wave Rapid, high-intensity shock Efficiency High energy-to-weight ratio Lower relative energy Lethality and Physical Effects

FAEs are notorious for their effectiveness in like bunkers, tunnels, and caves, where the fuel cloud can flow around corners before igniting.