Path: utzoo!attcan!uunet!decwrl!sdd.hp.com!samsung!cs.utexas.edu!tut.cis.ohio-state.edu!pt.cs.cmu.edu!MATHOM.GANDALF.CS.CMU.EDU!lindsay
From: lindsay@MATHOM.GANDALF.CS.CMU.EDU (Donald Lindsay)
Newsgroups: comp.arch
Subject: Re: Why not evacuate Disk drives.
Message-ID: <10064@pt.cs.cmu.edu>
Date: 1 Aug 90 15:03:21 GMT
References: <V%6$_&|@rpi.edu> <7592@amelia.nas.nasa.gov> <0093A806.2A4E2160@KING.ENG.UMD.EDU>
Organization: Carnegie-Mellon University, CS/RI
Lines: 9

In article <0093A806.2A4E2160@KING.ENG.UMD.EDU> sysmgr@KING.ENG.UMD.EDU 
	(Doug Mohney) writes:
>Why helium? That's pretty expensive, I'd think. Why not something "common" 
>like nitrogen?

The speed of sound is higher in helium.  Actually, hydrogen is even
faster, but it's not chemically inert.
-- 
Don		D.C.Lindsay