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04-13-2010, 07:02 AM
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Dear Lord, Thank You.
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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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