Back to Home

Blackholes Forum Message

Forums: Atm · Astrophotography · Blackholes · Blackholes2 · CCD · Celestron · Domes · Education
Eyepieces · Meade · Misc. · God and Science · SETI · Software · UFO · XEphem
RSS Button

Home | Discussion Forums | Blackholes I | Post
Login

Be the first pioneers to continue the Astronomy Discussions at our new Astronomy meeting place...
The Space and Astronomy Agora
RE: Re: Space Exposure

Forum List | Follow Ups | Post Message | Back to Thread Topics | In Response To
Posted by Brett Evill on March 27, 2000 06:23:37 UTC

G`day

A human body exposed to space would not explode. It would freeze-dry, just like foods that are exposed to vacuum to preserve them.

At any temperature water and ice give forth water vapour until the [partial] pressure of that vapour reaches a critical pressure called the `saturated vapour pressure`, which depends on what material is involved and also depends on the temperature. A human body contains moisture, and will therefore give forth water vapour. But this will not accumulate to the point of satuartion: the molecules will gradually drift forth into the vastness of Space. So the body will gradually dry out.

As this moisture evaporates it will carry off heat: latent heat of evaporation. So the body will freeze as it dries. As its temperature drops the saturated vapour pressure of its internal moisture will also drop, and the drying process will slow down. So it may take quite some time for the body to freeze-dry itself.

As for a living person exposed to vacuum, the experimental results with chimpanzees and the occurences in an accident testing equipment as part of the Apollo Program both suggest that a person would pass out for lack of oxygen within about fifteen seconds, and would shortly die of anoxia. When he or she died his or her heart would ceased to maintain blood pressure, and only then, after death, would the freeze-drying of the body begin. There might, however, be some superficial injury, a combination of frostbite and chapping, which would affect the moist tissues of the eyes and respiratory tracts well before death.

Follow Ups:

Login to Post
Additional Information
Google
 
Web www.astronomy.net
DayNightLine
About Astronomy Net | Advertise on Astronomy Net | Contact & Comments | Privacy Policy
Unless otherwise specified, web site content Copyright 1994-2020 John Huggins All Rights Reserved
Forum posts are Copyright their authors as specified in the heading above the post.
"dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET"
are trademarks of John Huggins