Texas Wastewater Class B Practice Exam

What characteristics describe methane gas?

1. Pungent and Colorless

2. Odorless and Heavier than air

3. Colorless, Odorless and Heavier than air

4. Yellow and Smelly

The correct answer is: Colorless, Odorless and Heavier than air

Methane gas is accurately described as colorless, odorless, and heavier than air. These characteristics make methane a unique and significant gas, especially in wastewater treatment and environmental contexts. Its colorlessness means it cannot be seen, and its odorlessness indicates that it doesn’t have a detectable smell, making it difficult to identify without specialized equipment or detection methods. Additionally, being heavier than air, methane tends to accumulate in low-lying areas, which can pose safety risks in enclosed spaces, as it can create explosive mixtures when ignited. Understanding these properties is essential for managing methane safely, particularly in wastewater facilities where it may be produced as a byproduct of organic matter decomposition. The other options provided do not accurately represent methane's characteristics, highlighting the importance of correct identification for safety and operational effectiveness in environments where methane is present.