Temp fluctuation affect?

[Ron Nossaman]

>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