Gas Fitter Practice Test

What is the specific gravity of propane gas?

1. 0.51

2. 0.60

3. 1.00

4. 1.52

The correct answer is: 1.52

The correct specific gravity of propane gas is 0.51. Specific gravity is defined as the ratio of the density of a substance to the density of a reference substance, typically air or water. In the case of gases, it is commonly calculated with reference to air. For propane, the specific gravity is approximately 0.51, which means that it is lighter than air (which has a specific gravity of 1.00). This characteristic is significant in applications where propane is used, such as in heating systems, where it tends to rise and dissipate if there is a leak, making it less likely to accumulate near the ground compared to heavier gases. Understanding the specific gravity of propane is crucial for gas fitters as it impacts safety practices and the design of systems using propane. It influences considerations for ventilation, leak detection, and the placement of appliances to ensure proper operation and safety.