Abstract

Fungi require water for nutrient absorption and normal metabolic activity. Water requirements for fungi and other microorganisms are usually expressed as water activities (aw). The water activity is equal to 1/100th the equilibrium relative humidity when expressed as a percent. Relative humidity is an expression of how much moisture is in the air as a percentage of the total moisture the air can contain at the current temperature. For example, if the air has all the water vapor that it can contain at a given temperature, the relative humidity is 100%; if the air has only half of the vapor that it can contain at a given temperature, the relative humidity is 50%. Equilibrium relative humidity is the humidity of a tested material while at the same vapor pressure as the ambient environment. In other words, moisture is not migrating to or away from the tested material.

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Fact Sheet: Moisture Requirements for Mold Growth

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