Question

Why is it necessary for astronauts to wear pressurized suits?

Answer 1

Astronauts must wear spacesuits whenever they leave a spacecraft and are exposed to the environment of space. In space, there is no air to breath and no air pressure.

We know, air only flows from high pressure to low pressure. Space has zero air pressure. Our lungs always has some air pressure. So, if astronaut moves to space, without pressurized suits, the air from his lungs will move to outside space ( low pressure) but he cannot breathe in air, as pressure in lungs is never lower than space press ure (which is zero). The only way he can breathe is, by creating a lower pressure in lungs, which is impossible. Lungs can only create small pressure differences.So, astronaut will choke to death.

When pressure suits are provided, atmospheric pressure is maintained around him in his suit, and his lungs can easily take in and leave out air.

So, pressure suits are necessary.