How does the specific gravity of air compare to that of propane vapor?

The specific gravity of a gas is a measure of its density relative to air. Air has a specific gravity of 1. Propane vapor has a specific gravity of approximately 1.50, meaning it is heavier than air. This comparison is crucial in applications involving propane, such as storage and handling because propane vapor tends to accumulate in low-lying areas due to its higher density.

Understanding the specific gravity of propane in relation to air helps in assessing safety measures during leaks, as heavier-than-air gases like propane can present risks if they build up in enclosed spaces. In this case, the correct answer highlights that propane vapor is 1.50 times heavier than air, illustrating the importance of considering gas properties when planning for proper ventilation and safety protocols in environments where propane is used.