What is the relative density of liquid propane compared to water?

The relative density of a substance is the ratio of its density compared to that of water, which is defined as having a relative density of 1.0. In the case of liquid propane, it has a relative density of approximately 0.5 when compared to water. This indicates that propane is less dense than water and will float on it.

Therefore, the correct answer is not 1.5, but rather a choice that accurately reflects this property. Understanding the relative density of propane is crucial for applications involving storage, transport, and safety measures when working with gas systems.

This knowledge helps in assessing buoyancy and behavior of propane in various environments, particularly when dealing with leaks or spills.