Amanda,
I'm not exactly sure what question you are asking, but I'll try to answer
anyway. RH is a percentage. Therefore, any variation is already a
percentage. For example, if RH ran from 50% to 70% over a period, there was
a 20% RH variation. If this is what you are looking for, you're done. If
not, please refine the question if you can. Temperature is much more
difficult. Assuming you are working in the Fahrenheit system, temperatures
can run from -451 degrees to +infinity. Thus, it is not really possible to
assign a percentage to a variation. You technically could use a percentage
of variation from a given number, for example inaccuracy of a thermometer of
+/- 10%. The trouble here is that if the temperature reads 0, technically
there is no variation (10% of 0 = 0), while if it reads 100, the variation
is 10 degrees (10% of 100 = 10). Normally variation for temperature is
given as +/- degrees F, not as a percentage. Again, please clarify if this
does not help.
Marc
American Conservation Consortium, Ltd.
4 Rockville Road
Broad Brook, CT 06016
www.conservator.com
860-386-6058
*Collections Preservation Consultation
*Conservation Assessments & Surveys
*Low-Tech Environmental Control
*Moisture Management Solutions
*Collections in Historic Structures
*Conservation Treatment of:
Furniture
Painted Wood
Horse-Drawn Vehicles
Architectural Interiors
Marc A. Williams, President
MS in Art Conservation, Winterthur Museum Program
Former Chief Wooden Object Conservator, Smithsonian Institution
Fellow, American Institute for Conservation (AIC)
----- Original Message -----
From: "Amanda Thompson Dyer" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, November 17, 2006 3:57 PM
Subject: [MUSEUM-L] variation percentages?
Hello Everyone:
At the risk of revealing my math deficiency, how does one determine the
variation percentage of temperature (Fahrenheit) and RH within a certain
period? I know there has to be a formula out there somewhere, but I'm not
having much luck finding it. (I think I may be suffering from a debilitating
case
of Friday-itis.)
Thanks!
Amanda Thompson Dyer
Curator
Bell County Museum
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