What happens to propane when released into the air, relative to its weight compared to air?

The behavior of propane when released into the air is primarily determined by its density relative to air. Propane is denser than air; therefore, when released, it tends to sink rather than rise. Because it is heavier, propane can accumulate in low-lying areas, which poses a safety risk as it can lead to a concentration of gas that can ignite if exposed to an ignition source.

In contrast, the other outcomes suggest that propane either rises (which isn't accurate due to its density), remains suspended (which wouldn't hold true as it tends to settle), or evaporates (though propane is already a gas at room temperature, it doesn't evaporate in the way a liquid would). Understanding the properties of propane, particularly its density in relation to air, is crucial for recognizing the potential hazards associated with its release.