Vapour Pressure Osmometer - Wescor 5500 - Article 222 - go-pugleaf

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Vapour Pressure Osmometer - Wescor 5500

#222

From: Gary
Date: Tue, 03 Jun 2003 19:24

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I was wondering if anyone out there knows how to convert the readings
from the Wescor - 5500 (in mmol/kg) to water activity (Aw).  I have
converted the results to dynes/cm2, but I am now stuck there.  The
solutions I am measuring are complex mixtures and the concentrations
of all the contributing solutes are not known.  So, is it even
possible to convert these vapour pressure readings to water activity??

Thanks,
Gary

Some example data #1: 2966 mmol/kg = 7.21x10^7 dynes/cm2 = Aw???
                  #2: 2910 mmol/kg = 7.07x10^7 dynes/cm2 = Aw???

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From: gp95ac@brocku.ca (Gary)
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Subject: Vapour Pressure Osmometer - Wescor 5500
Date: 3 Jun 2003 12:24:02 -0700
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