Red Seal Gasfitter — Class A 2025 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 400

What are the characteristics of propane gas?

It is lighter than air, colorless, and has no odor

It is heavier than air, colorless, and has a distinct odor added for safety

Propane gas is characterized as heavier than air, which means that it tends to accumulate in low-lying areas since it does not disperse as easily as lighter gases. It is colorless, which is a typical characteristic of many gases. Additionally, propane is specifically treated with an odorant, such as ethyl mercaptan, to give it a distinct smell for safety purposes; this allows for easy detection of leaks. This property is crucial in preventing accidents and ensuring safe usage.

In contrast to the other options, which either misstate its physical properties or omit the critical safety feature of the odorant, the correct description accurately captures these essential characteristics of propane.

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It is blue in color and nontoxic

It is odorless and more expensive than natural gas

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