What is the specific gravity of propane liquid at 60°F?

The specific gravity of a substance is a measure of its density compared to the density of water at a specified temperature. For propane, the specific gravity of liquid propane at 60°F (approximately 15.6°C) is commonly accepted to be around 0.505. This means that propane is about half as dense as water, which has a specific gravity of 1.

Given this context, the choice stating a specific gravity of 0 is incorrect, as it suggests that propane has no mass or density, which is not true. The correct selection reflects that propane does indeed have a measurable specific gravity, consistent with the known values in the industry. Therefore, understanding that the specific gravity of propane liquid is significantly greater than zero helps reinforce the characteristics and behavior of this fuel in various applications.