Obviously Ray Must not work at the same Institution that I do because I fight with moisture content every day at this school. I mean it is a hard fight. Lonnie Young -----Original Message----- From: owner-caut@ptg.org [mailto:owner-caut@ptg.org] On Behalf Of Ron Nossaman Sent: Wednesday, January 23, 2002 6:42 AM To: caut@ptg.org Subject: Re: Temp fluctuation affect? >Sorry, guys. > >I've taught science too many years to accept that the relative humidity >change has anything to do with the change in wood moisture content. >Relative humidity changes as temperature changes, but the actual amount of >moisture may indeed stay the same. I understand all about dew point, etc., >but actual moisture content does not change because the relative humidity >does UNLESS the temperature stays the same. > >A sealed container of air (or wood)may hold X amount of moisture. If it is >heated, its relative humidity goes down, because it is capable of holding >more moisture at a higher temperature. The converse is true upon cooling. >True, wood being a solid, there is less difference caused by temperature >than in air. But the content doesn't necessarily change with the relative >humidity reading which depends upon the temperature at which the humidity >reading is taken. > >Ray T. Bentley, RPT I have an Excel 97 (PC) spreadsheet which derives MC from temperature and RH% measurements that makes this point very obvious. Anyone interested, reply privately and I'll send you a copy. Ron N
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