What is the characteristic smell of pure methane gas?

Pure methane gas is odorless, which is why the characteristic smell of pure methane is described as having no detectable odor. It is important to note that while methane itself does not have an inherent smell, natural gas, which is primarily composed of methane, is often mixed with a chemical called mercaptan to give it a distinct odor for safety reasons, typically resembling rotten eggs. This odorization helps in detecting leaks, as pure methane's lack of smell can pose significant safety hazards if it accumulates. Understanding the characteristics of gases, such as methane, is crucial in wastewater management and related fields, as it enhances safety protocols concerning gas monitoring and management.