““Before engineers and scientists had acquired experience with large quantities of liquid hydrogen, they were fearful of its explosive properties. Now, though, after several decades of working with it in laboratories and in rocketry, they've concluded that it's less dangerous than gasoline or jet fuel. In the crash of a hydrogen-fueled aircraft, the hydrogen would tend to rise very quickly because of its light weight. Though it would certainly burn, the flames and heat would be high in the air. Ordinary jet fuel stays on the ground as a liquid, soaks the clothing of crash victims, and burns them at ground level.””
