1. Timber seasoning

2. Keywords Equilibrium Hygroscopic Kiln Relative humidity Stickers
Timber seasoning

3. Definitions
Equilibrium ; (noun) - a stable situation in which forces cancel one another.
Hygroscopic ;  (adjective) - absorbing moisture (as from the air).
Kiln ; (noun) - a furnace for drying wood.
Relative Humidity ; (noun) - the ratio of the amount of water in the air at a given temperature to the maximum amount it could hold at that temperature; expressed as a percentage.
Timber Seasoning ; the drying out of timber to a moisture content of 20% or below.