CORN UNITS is a term used to describe the various measurements of corn. A bushel is a unit of volume equal to 8 gallons, and is commonly used to measure dry goods such as corn. A cob is a unit of measurement for a single EAR of corn, and is usually around 4-5 inches in length. KERNELS are the individual seeds of corn, and an EAR is a single stalk of corn with multiple KERNELS. An EAR is typically around 7-9 inches in length.