What specific gravity comparison is true for propane vapor?

The specific gravity of a substance is a measure of its density compared to the density of air. In the case of propane vapor, it is generally considered to be lighter than air. The correct understanding of propane vapor is that its specific gravity is approximately 1.5, which means it is heavier than air, as the specific gravity of air is around 1. This is significant in safety considerations, as propane vapor can accumulate in low-lying areas and present a risk of explosion if it is not adequately ventilated.

By knowing that propane vapor is heavier than air, safety and handling protocols can be better understood, ensuring that proper precautions are taken to avoid hazardous situations. This knowledge is critical for storage, transportation, and the application of propane in various settings.