What Happens If You Try To Breathe In Space?
Trying to breathe in the vacuum of space results in instantaneous and life-threatening consequences, as your lungs would collapse and the lack of pressure would cause the moisture in your body to violently boil.
The Silent Killer: The Vacuum
Space is almost a perfect vacuum, meaning it contains virtually no air. This is drastically different from Earth’s atmosphere, which exerts a significant pressure. Understanding this pressure differential is crucial to understanding what happens if you try to breathe in space.
Lungs Under Pressure
Our lungs are designed to function within a specific pressure range. The air we breathe pushes against the walls of our lungs, keeping them inflated. When we exhale, we reduce that pressure, allowing the lungs to contract and expel air. In space, however, there’s no external pressure to counterbalance the internal pressure of the gases inside our lungs.
The Boiling Point Paradox
One of the most horrifying consequences of space exposure is the effect of the vacuum on liquids. In a vacuum, the boiling point of liquids dramatically decreases. This means that the water in your saliva, tears, and other bodily fluids will begin to boil rapidly at body temperature. This isn’t the scalding boil we’re familiar with, but rather, a phase change occurring with bubbling.
Immediate Effects and Long-Term Consequences
The immediate effects of exposure to the vacuum of space are devastating. Beyond the boiling of bodily fluids, other issues arise:
- Oxygen Deprivation: Without air to breathe, you’ll quickly lose consciousness due to lack of oxygen.
- Lung Rupture: The difference in pressure will cause your lungs to rupture. Trying to hold your breath makes this even worse.
- Swelling: Your body tissues will swell as fluids seep out of cells. This is sometimes incorrectly referred to as “exploding”, but it’s more of an extreme swelling.
- Sunburn: Without the protection of the Earth’s atmosphere, you’ll be exposed to dangerous levels of radiation, leading to severe sunburn.
Survival Chances (and How to Improve Them)
While the scenario sounds bleak, there’s a surprising amount of misinformation surrounding the immediate lethality of vacuum exposure. While unprotected exposure is fatal, survival is possible for a short period.
| Factor | Impact |
|---|---|
| Duration | The longer the exposure, the lower the chance of survival. |
| Pre-existing Conditions | Individuals with underlying health problems may be more vulnerable. |
| Emergency Response | Immediate medical attention is critical for survival and minimizing long-term damage. |
The key to survival is rapid decompression and immediate medical assistance.
Space Suits: Your Personal Atmosphere
Space suits are designed to provide a pressurized environment, shielding astronauts from the hostile conditions of space. These suits regulate temperature, supply breathable air, and protect against radiation. Without a suit, venturing into space is a guaranteed death sentence.
Frequently Asked Questions
What is the first thing you would feel if you were exposed to space without a suit?
The first sensation would likely be the boiling of moisture on your skin and in your eyes and mouth, coupled with a feeling of immense pressure in your chest, followed quickly by disorientation and loss of consciousness.
How long could you survive in space without a suit?
Survival time is extremely limited, perhaps 15 to 30 seconds of consciousness and a total survival time of around two minutes, assuming rapid rescue and medical intervention.
Is it true that your blood boils in space?
While the visual is gruesome, blood itself doesn’t exactly boil. The water content within your blood will begin to vaporize, but the blood vessels themselves will maintain some structural integrity for a short period.
If you held your breath, would you survive longer in space?
Holding your breath is a dangerous mistake in space. It will cause your lungs to rupture more violently due to the expanding air within them. Exhaling fully is crucial.
Does space instantly freeze you?
While space is cold, the main threat isn’t freezing. Heat loss is slow in a vacuum due to the lack of conduction and convection. Decompression and oxygen deprivation are the immediate killers.
Can you get a sunburn in space?
Yes, drastically worse than on Earth. Without the atmosphere, you’re exposed to intense solar radiation, leading to severe burns.
Would your body explode if exposed to space?
No, your body wouldn’t explode in the traditional sense. The low pressure causes swelling as bodily fluids expand, but the skin provides some structural resistance.
What is the most common cause of death in space-related accidents?
Decompression and oxygen deprivation are the primary causes of death in space-related accidents involving vacuum exposure.
Do astronauts practice for exposure to the vacuum of space?
Yes, astronauts undergo extensive training in simulated environments to prepare for emergencies, including procedures for rapid response to decompression.
If space is a vacuum, why do spacecraft need shielding from micrometeoroids?
Even though space is mostly empty, micrometeoroids travel at incredibly high speeds. These tiny particles can cause significant damage to spacecraft, so shielding is essential.
What are the long-term health effects of surviving exposure to space without a suit?
Long-term effects can include neurological damage, vision problems, and severe lung damage, even with prompt medical intervention. The extent of the damage depends on the duration of exposure.
What happens to a body left in space without a spacesuit?
The body would initially freeze and dehydrate. Over time, radiation would degrade organic matter. Without atmospheric decomposition, it would remain in a preserved state for a very long time.