Which of the following is true regarding the specific gravity of propane vapor?

The specific gravity of propane vapor is indeed heavier than air. This means that when released, propane vapor will tend to stay closer to the ground rather than dispersing into the atmosphere. This information is critical for safety practices in handling and storing LP-gas, as it helps in understanding how propane behaves in case of a leak.

In contrast, helium is much lighter than air, which is why it causes balloons to float. Nitrogen has a specific gravity similar to air, meaning it does not tend to rise or fall substantially compared to air. Although carbon dioxide is heavier than air, propane vapor is notably heavier than both air and carbon dioxide, which is important when evaluating safety protocols and emergency responses in the event of a leakage. Recognizing the specific gravities of various gases is essential for safely managing LP-gas in various environments.