What does kokusu measure in terms of sake production?

Kokusu measures the total volume of sake produced during a specific bottling or batch. This term helps sake brewers and producers keep track of the quantity they are working with, which is essential for inventory management, production planning, and sales forecasting. Understanding kokusu is vital for assessing production capacity and for ensuring consistency in manufacturing processes.

The other options relate to different aspects of sake but do not define kokusu. Quality is influenced by various factors including the rice polishing ratio and fermentation methods, while the age of the sake is measured by the time elapsed since brewing. The type of rice used is categorized by its specific varieties but is not what kokusu addresses.