Dear Crispin,
Just wondering. Why is it so important to measure water vapor in stack gas? When you put in a chunk of new wood with 20% moisture you get a very high concentration of water vapor then when that is gone you get the water vapor of the hydrogen in the cellulose structure turning into water (HHV) if I am understanding this right. Such an extreme. Thanks Frank Frank Shields Control Laboratories, Inc. 42 Hangar Way Watsonville, CA 95076 (831) 724-5422 tel (831) 724-3188 fax <http://www.biocharlab> www.biocharlab.com From: Stoves [mailto:[email protected]] On Behalf Of Crispin Pemberton-Pigott Sent: Friday, March 22, 2013 5:11 PM To: 'Discussion of biomass cooking stoves' Subject: Re: [Stoves] Relative Humidity question Dear Frank That is a really good question. I append the question: what instrument can read a water concentration of 100 mmoles/mole H2O? The same calibration question arises. Thanks Crispin ++++++++ Dear Stovers, I have a question regarding Relative Humidity. A saturated mix of water and magnesium nitrate (for example) at 40c will produce a 'percent relative humidity' in the air trapped in the container above of 48.42 +/- 0.37. What does this mean? Is there a value of grams water per cubic meter of gas (or some other unit) that we can use to calibrate instrumentation measuring water vapor? Thanks Frank
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