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Because a space suit is used to provide the human body with earth-like conditions inside the suit. Earth already has earth-like conditions, therefore we do not need suits to be on the earth. On earth, we already have an atmosphere and the proper pressure and temperature to keep the atmospheric gasses dissolved in our blood and going to our tissues.

There are places on earth when we do need a 'suit' to stay alive. Places where the temperature, atmosphere and/or pressure are not adequate to keep us functioning properly require us to wear suits. Under water would be one place. There, we need a suit to keep us warm, and a mask to keep us breathing. Another place that I can think of is on top of a high mountain. Up there, the pressure is reduced enough that we have a difficult time getting enough oxygen to dissolve into our blood. So we increase our lungs' exposure to oxygen by wearing an oxygen mask.

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15y ago

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