Message-Id: <l03102801b0607a3b6b02@[153.90.236.25]>
In-Reply-To: <v01540b01b05f839789b2@[208.155.130.241]>
Date: Tue, 7 Oct 1997 16:54:15 -0700
To: pinhole@exploratorium.edu
From: Steven Eiger <eiger@montana.edu>
Subject: Re: basic chemistry questions from new teacher
Dear Jory, Just to add a few things to what has already been very helpful..
When Something is diluted 1:3 it often becomes a four fold dilution, sort
of a semantic issue here which affects the results. Perhaps a good way to
think about it is to envision the same quantity of HCl dispersed into three
times the volume; this usually means adding two parts of water to one of 3N
HCl to get 1N HCl.
The other is with sublimation. One can look at various
phase/jpressure/temperature diagrams to find situations where things can
change from solid to gas. I did hear of a study on why one could ice
skate, and it is not because of the pressure creating a lizuid layer, but
the researchers claimed that a layer of water always existed on the surface
of solid water, which accounted for the low friction. Kind of
interesting. Eiger