What is the specific gravity of propane vapor?

The specific gravity of propane vapor is approximately 1.50. Specific gravity is a measure of the density of a substance in comparison to the density of air. Since propane vapor is denser than air, a specific gravity greater than 1 indicates that it will rise in air. This means that propane vapor will tend to collect in low-lying areas as it is released, which is crucial for safety awareness during its handling and use.

Understanding the specific gravity is important for those working with LP gas, as it influences how propane behaves in the event of a leak. Knowing that propane vapor has a higher specific gravity helps professionals anticipate and mitigate risks associated with vapor accumulation.

The other options represent different specific gravities that do not accurately reflect propane's physical properties. For instance, a specific gravity of 0.75 would suggest that propane vapor is lighter than air, which is not consistent with its actual behavior.