Gas Technician Certification Practice Exam 2025 – Your Complete All-in-One Resource to Guarantee Exam Success!

Natural gas is primarily composed of methane, which has a lower molecular weight compared to air. Air is a mixture of gases, primarily nitrogen and oxygen, with an average molecular weight of about 29 g/mol. Methane (natural gas) has a molecular weight of approximately 16 g/mol. When comparing the densities, because methane's molecular weight is significantly lower, natural gas is lighter than air.

This property of natural gas being lighter than air is critical in various applications, including its handling and the safety protocols established for its use. In case of a leak, natural gas will rise and disperse into the atmosphere, whereas heavier gases would accumulate closer to the ground, presenting a different set of risks. Understanding this behavior is essential for gas technicians, as it impacts how they perform leak detection and ensure safety measures are in place.