Canadian Entry To Practice (CETP) Practice Test

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A vapor substance with a specific gravity of .805 is what compared to propane vapor?

Lighter
Heavier
Equal
Denser

The correct answer is: Lighter

The specific gravity of a substance measures its density relative to the density of water, where water's specific gravity is defined as 1. A vapor substance with a specific gravity of 0.805 means that it is less dense than water. In comparison to propane vapor, which has a specific gravity of approximately 1.52, the vapor with a specific gravity of 0.805 is significantly lighter. Since specific gravity values less than 1 indicate that a substance is lighter than water, and when comparing two vapors, if one has a lower specific gravity than another (like propane), it will be lighter in terms of vapor density as well. Therefore, this vapor substance being lighter than propane vapor is confirmed by its specific gravity being less than that of propane.