It is very cold in space, but it is actually a misunderstanding caused by watching too many movies!
In the thermodynamic definition,Temperature is a function of the amount of heat in a certain amount of matterit is clear that a vacuum has no mass.
In addition, we know that the heat from the sun reaches the earth through radiation, which is the only way to transfer heat in a vacuum, where the other two heat transfer methods (conduction and convection) do not occur!
This means that even if we drop us in a cosmic environment of 2.7k (near absolute zero, which is the temperature of the “cosmic microwave background” left over from the Big Bang that pervades the universe), we will not be immediately frozen, It actually takes a long time because our body loses heat very slowly only through radiation.
So the answer is obvious,If we’re exposed to space, we’re more likely to suffocate! But such suffocation and suffocation in water are two different things.
Another feature of space is the absolute low pressure. If we keep our mouths closed, our lungs will inflate and eventually burst and die.
Also, even if we find a way to empty the lungs, sudden decompression can lead to blood boils, because the pressure is reduced and the fluid in the body reaches boiling temperature.
(If you don’t understand this boiling syndrome, imagine the situation where the temperature of the boiling water becomes lower at high altitudes.)
Since human body fluids are encased in the skin, when these fluids turn into vapors, they can cause the body to swell up, which can cause some damage to the body, but it may not be the most deadly.
The real reason is hypoxia!
As we said before, if we don’t want to burst, we have to let the air out of the lungs, but even if we let the air out, there is still a terrible process that will cause the oxygen to be quickly lost.
When our lungs are exposed to a vacuum, it does the exact opposite of what it does under normal atmospheric pressure.
Normally, we let oxygen seep through the lungs into the blood, but in a vacuum,Oxygen in the blood is lost through the lungs because the external pressure is too low.
So, if we fell into space, we would use up our oxygen faster than if we fell into water (the oxygen in our blood lasts for a while when we hold our breath in water).
According to NASA data,It only takes about 15 seconds for deoxygenated blood to flow into the brainwe will enter a coma, and in a state of hypoxia coma, our body can only last for 1 minute at most.
That is,When we fell into space, 1 minute and 15 seconds looked like it was useless.
Hashtags: Universe, Astronomy, Space, Space
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