Technical Standards and Safety Authority (TSSA) G3 Practice Exam

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What is the specific gravity of natural gas in relation to air?

  1. Greater than that of air

  2. Less than that of air

  3. The same as that of propane

  4. Greater than that of propane

The correct answer is: Less than that of air

The specific gravity of natural gas in relation to air is less than that of air. Specific gravity is a ratio that compares the density of a substance to the density of another substance, typically air in this case. Natural gas, primarily composed of methane, has a specific gravity ranging from about 0.6 to 0.9, meaning it is lighter than air, which has a specific gravity of approximately 1. This characteristic is important for safety and operational considerations. Since natural gas is lighter than air, it tends to rise and disperse in the event of a leak, which affects how gas is detected and how it accumulates in enclosed spaces. This behavior is significant when planning for ventilation and safety measures in environments where natural gas is utilized. Understanding this property aids in preventing hazards associated with gas accumulation.

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