Which of the following is not a standard kernel size?

The correct answer is based on the understanding of standard kernel sizes used in the brewing industry. When it comes to malted grains, kernel sizes can impact the overall brewing process, including efficiency of extraction and the characteristics of the final product.

Typically, standard kernel sizes are expressed in fractions of an inch, with common sizes including 5/64, 6/64, and 7/64. These sizes are used because they correspond to the most common mill settings in the brewing process, allowing for optimal crushing and extraction of sugars during mashing.

The size 8/64, which is equivalent to 1/8 of an inch, is not a recognized standard kernel size within the industry. Thus, it does not fit within the accepted ranges for grain milling and is less likely to provide the needed properties for effective brewing.

Understanding these kernel sizes is crucial for brewers when selecting or milling their grains, as incorrect sizing can lead to inefficient extraction, changes in the flavor profile, or issues during the brewing process.