What does "steam quality" refer to in relation to boiler output?

The term "steam quality" specifically pertains to the ratio of vapor to liquid in steam. This measure indicates the purity of the steam being produced by a boiler. A higher steam quality means that there is a greater proportion of vapor compared to liquid water, which is essential for various applications that require dry steam. High-quality steam is more efficient for heating and power generation, as it carries more energy and minimizes the risk of water carryover into steam systems, which can cause damage and reduce efficiency.

In the context of boiler operations, understanding steam quality is crucial because it relates directly to the effectiveness of heat transfer and system performance. Therefore, maintaining high steam quality ensures optimal operation and efficiency of the boiler system, making option B the correct choice.