What role does airflow play in the coffee roasting process?

• A. It controls humidity levels
• B. It helps control temperature and roast uniformity
• C. It determines the bean's appearance
• D. It increases roasting time

Answer: (B)

Airflow is a crucial component in the coffee roasting process primarily because it helps control both temperature and roast uniformity. During roasting, the circulation of air through the roasting chamber influences how heat is distributed and how quickly coffee beans are roasted.

When airflow is increased, it allows for better heat transfer to the beans, resulting in a more even roast. This is particularly important to avoid the phenomenon of "hot spots," which can lead to uneven development of flavor in the beans. Consistent airflow helps maintain a stable temperature, which is essential for achieving the desired roast profile.

Additionally, controlled airflow can help regulate the rate of temperature increase during the roasting process, allowing roasters to manage the progression of the roast more precisely. This leads to more consistent results batch after batch, which is critical for roasters aiming to produce high-quality coffee.

While airflow does play a role in humidity and can affect the appearance of the beans, its primary importance lies in its direct influence on temperature regulation and uniformity of the roast.