Canadian Entry To Practice (CETP) Practice Test

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What is the relationship between specific gravity and buoyancy for L.P. gas?

Higher specific gravity indicates more buoyancy
Lower specific gravity indicates more buoyancy
Specific gravity does not affect buoyancy
Buoyancy is only affected by temperature

The correct answer is: Lower specific gravity indicates more buoyancy

The relationship between specific gravity and buoyancy in the context of liquefied petroleum (LP) gas is grounded in the principles of fluid mechanics and the behavior of gases. Specific gravity is a measure of the density of a substance compared to the density of water. When LP gas has a lower specific gravity, it indicates that the gas is lighter than air or, more broadly, has a density lower than that of the surrounding medium (air). This decreased density leads to an increased buoyant force acting on the LP gas when it's in the atmosphere. Consequently, as the specific gravity decreases, the tendency of the gas to rise (i.e., its buoyancy) increases. Thus, lower specific gravity indeed correlates with higher buoyancy, enabling LP gas to rise and disperse into the atmosphere more readily than heavier gases. This principle is crucial for understanding safety measures related to LP gas, as it affects how gas disperses in the event of a leak.