home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!news.univie.ac.at!scsing.switch.ch!univ-lyon1.fr!ghost.dsi.unimi.it!rpi!usc!howland.reston.ans.net!spool.mu.edu!hri.com!noc.near.net!transfer.stratus.com!sw.stratus.com!det
- From: det@sw.stratus.com (David Toland)
- Newsgroups: sci.astro
- Subject: Re: Vacuum Question
- Message-ID: <1k63fvINNhul@transfer.stratus.com>
- Date: 27 Jan 93 13:42:23 GMT
- References: <oZRsXB4w165w@ersys.edmonton.ab.ca> <1993Jan27.070005.13031@mr.med.ge.com>
- Reply-To: somebody@somehost.edu
- Organization: Stratus Computer Inc.
- Lines: 22
- NNTP-Posting-Host: phlan.sw.stratus.com
-
- In article <1993Jan27.070005.13031@mr.med.ge.com>, hinz@bonfire (David Hinz (hinz@picard.med.ge.com)) writes:
- > I don't know if I buy the freeze in seconds bit. As I recall reading,
- > perhaps here, space is not so good at being a heat sink. Yes, it's
- > quite cold (not many moving molecules), but it can't carry heat away
- > from you too fast (same reason).
-
- Umm, the temperature is *not* measured by the number of moving molecules,
- but rather their velocity distribution. You are correct, however, in
- saying they cannot transfer much heat out of a body. Convection and
- conduction are definitely unimportant heat gain/loss mechanisms in
- the vacuum of space. Radiational heating/cooling and heat of phase
- change (e.g. evaporation of volatiles) are more important, yet still
- not high rate under conditions of a human body exposed in space.
-
- (Well, radiational heating at 1 A.U. *is* pretty significant - ask
- anyone who has gotten sunburned by falling asleep on the beach).
-
- --
- --------------------------------------------------------------------------
- All opinions are MINE MINE MINE, and not necessarily anyone else's.
- det@phlan.sw.stratus.com | "Laddie, you'll be needin' something to wash
- | that doon with."
-