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Old 04-13-2010, 07:02 AM   #2
shilala
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Default Re: Hydrometer Calibration Question

It's a physical property of salts. Many salts yield a specific RH over themselves when saturated.
When you put the salt in a small area and make a solution of it, it will release water from itself and gather water into itself, all the while trying to be about 75% RH.
Different salts yield different RH's.
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