We all know what happens to a perfectly flat piece piece of wood when it travels into a different climate with a lower or higher humidity. Even though the wood is dry, the fibers can expand or contract depending on the humidity, which can result in cupping, bowing or cracking.

The following article written by Stephen Smulski, PH.D., president of Wood Science Specialists Inc. gives an overview of how wood moisture content is affected by humidity and temperature.

Humidity, temperature, and wood moisture content

Water vapor is always present in the air. The amount of water vapor air can hold depends upon its temperature: warm air can hold more than cold air. The maximum amount of water vapor that air of a given temperature can hold is called its absolute humidity at saturation…..

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