<P> The equilibrium moisture content (EMC) of a hygroscopic material surrounded at least partially by air is the moisture content at which the material is neither gaining nor losing moisture . The value of the EMC depends on the material and the relative humidity and temperature of the air with which it is in contact . The speed with which it is approached depends on the properties of the material, the surface - area - to - volume ratio of its shape, and the speed with which humidity is carried away or towards the material (e.g. diffusion in stagnant air or convection in moving air). </P> <P> The moisture content of grains is an essential property in food storage . The moisture content that is safe for long - term storage is 12% for corn, sorghum, rice and wheat and 11% for soybean </P>

When do you say that grains are in equilibrium moisture content
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