Discussion
Specific heat of a grain generally
Answer: B
Correct answer: Rises with moisture content
Grain is a mixture of dry matter and water, and water's specific heat, about 4.18 kJ/kg K, is far above that of the dry solids, roughly 1.0 to 1.5 kJ/kg K. The mixture's specific heat is therefore close to a mass-weighted average of the two, and adding water raises it.
The common empirical forms reflect exactly this, being linear in moisture - for instance \( c = 1.0 + 3.2M \) kJ/kg K with \( M \) the dry basis moisture as a fraction. It matters in drier design, because wet incoming grain absorbs more heat per degree of temperature rise than the same mass of dry grain.
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