See this post for a bunch of morbid details of what happens when you die – in various different ways. It’s all there – death by hanging, burning, drowning, falling from a height, heart-attacks. It’s certainly not “useful” information, but I know you wont be able to resist reading the whole thing.
Here is an excerpt talking about how you would die if you find yourself in a vacuum:
Most of our knowledge of depressurisation comes from animal experiments and the experiences of pilots in accidents at very high altitudes. When the external air pressure suddenly drops, the air in the lungs expands, tearing the fragile gas exchange tissues. This is especially damaging if the victim neglects to exhale prior to decompression or tries to hold their breath. Oxygen begins to escape from the blood and lungs.
Experiments on dogs in the 1950s showed that 30 to 40 seconds after the pressure drops, their bodies began to swell as the water in tissues vaporised, though the tight seal of their skin prevented them from “bursting”. The heart rate rises initially, then plummets. Bubbles of water vapour form in the blood and travel through the circulatory system, obstructing blood flow. After about a minute, blood effectively stops circulating.
Human survivors of rapid decompression accidents include pilots whose planes lost pressure, or in one case a NASA technician who accidentally depressurised his flight suit inside a vacuum chamber. They often report an initial pain, like being hit in the chest, and may remember feeling air escape from their lungs and the inability to inhale. Time to the loss of consciousness was generally less than 15 seconds.
See full article.