Relative Humidity (Junior Cert Wood Technology): Flashcards

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Relative Humidity
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Define Relative Humidity (RH)

Moisture in air vs max it can hold at that temperature

RH role in timber seasoning

Balances moisture in timber

Define Moisture Content

Water weight in timber vs dry weight as percentage

Moisture Content indicates

When timber seasoning is complete

Define Hygroscopicity

Ability to absorb or release moisture

Hygroscopicity effect on wood

Makes wood expand or shrink

Why control RH in seasoning

Manages drying rates, prevents warping and cracking

High RH effect on timber

Raises timber's moisture content

Low RH effect on timber

Lowers timber's moisture content

Wood's reaction to RH changes

Takes in or releases moisture, changing size and shape

Hygroscopicity importance

Keeps wood stable, e.g., in furniture making

RH role in drying schedules

Stops defects like warping, checking, case hardening

RH manages in drying process

Rate of moisture reduction inside wood

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