Will the human body explode in a vacuum?

When the spaceship crashed and the unfortunate adventurers were brutally exposed in space, they screamed, twitched, expanded rapidly and then burst into blood.

This is usually demonstrated in science fiction movies, which sounds reasonable based on our understanding of outer space. However, after human beings visited the atmosphere, some unintentional vacuum exposure accidents began to make scientists think about this question-what would happen if an unprotected person was exposed to a cold and lifeless vacuum?

In the 1960s, NASA did some low-pressure tests to understand the human body's response to low pressure. 1965 had an accident in a test. A technician was highly exposed to a vacuum, and the broken protective clothing could not provide pressure. He went into a coma after 14 seconds. Surprisingly, he woke up after the pressurization-he was not injured. In the last accident, another technician was trapped in an artificial low-pressure room for 4 minutes. He lost consciousness and his skin was blue. Fortunately, before death met him, he kicked off a glass device of the damn machine, and then air entered.

In this way, things are not what we imagined. When the human body is suddenly exposed to a vacuum, it will really cause physical injury immediately. At first they were not obvious, but soon they were in danger. First of all, the gas in the lungs diffuses due to the decrease of external pressure. At this time, rapid exhalation (perhaps an instinctive call for help) can increase his chances of survival and reduce the possibility of lung rupture and gas entering the blood. Then, because there is no air pressure, the water in the human body will turn into steam-it will be ejected from the victim's mouth and eyes, and some parts will swell without causing skin rupture.

In a few seconds, nitrogen dissolved in the blood will form bubbles due to a sharp drop in pressure-similar to the painful experience of diving into deep water. After about ten seconds, the poor man will feel very uncomfortable, but he still has plenty of time to save himself. After ten seconds, the victim's vision and sensory judgment will drop rapidly, and his body temperature will drop rapidly due to water evaporation-his mouth and nose will almost freeze, then he will twitch and his skin will turn blue.

At this time, the victim began to coma. But his brain is not damaged and his heart will continue to beat. As long as there is pressure and oxygen supply within one and a half minutes, he can be remedied, and it is only a minor injury. But if he doesn't take action after 90 seconds, his blood pressure will drop rapidly, his blood will boil and his heart will stop beating. There is no record of survival beyond this limit.

Although the human body can't survive in outer space for a long time, its excellent viability can be measured in minutes instead of seconds, and it can stay in such a terrible environment for nearly two minutes without irreparable damage. The human body is really a super resilient machine.