What does “propane-specific gravity” measure?

Propane-specific gravity measures the ratio of propane's density compared to that of air. This value helps determine how propane will behave in different environments, particularly regarding its buoyancy and how it disperses when released. For practical applications, understanding specific gravity is crucial for safety and handling, as it influences decisions about ventilation and leak detection. If propane is released, knowing that it is heavier or lighter than air can inform how it accumulates or dissipates in the atmosphere, which is vital for preventing hazards.

The other choices focus on different aspects of propane or gas properties. The percentage of propane in a mixture relates to concentration rather than density comparison, the volume of propane in a tank pertains to measurements of storage rather than density relationships, and combustibility relates to how easily propane ignites, which is not directly associated with its specific gravity.