A spacesuit is a pressurized (filled with air pressure) garment worn by astronauts during spaceflights. It is designed to protect them from the potentially dangerous conditions they may experience in space.
It provides the necessities for life support, such as oxygen, temperature controls, a pressurized enclosure, CO2 removal, and protection from sunlight, solar radiation, and micro-meteoroids.
At 63,000 feet AMSL (21 km), water boils at 99°F or 37°C, basically the temperature inside our bodies, which is why if you were to go that high, you'd need a spacesuit to keep your blood from boiling.
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