What is one of the characteristics of hydrogen sulfide (H2S)?

One of the key characteristics of hydrogen sulfide (H2S) is that it has a distinct odor that can be likened to that of rotten eggs. This characteristic odor is significant because it acts as a warning signal for individuals who may be exposed to this hazardous gas. Being able to detect the smell can alert workers to the presence of H2S before they are exposed to potentially harmful levels, thus promoting safety in environments where the gas may be present, such as in certain industrial and agricultural settings.

Although H2S is also colorless and has other properties that are important to note, the olfactory detection provided by its characteristic "rotten egg" smell serves a critical safety function. This makes it easier for individuals to recognize the danger and take appropriate actions, such as evacuating from the area or using personal protective equipment.