What methods can be used to identify Sulfur Dioxide (SO2)?

Identifying Sulfur Dioxide (SO2) through odor and taste is valid because this gas has a distinct, sharp smell often associated with burnt matches or garlic. In many cases, this sensory detection is the first indication of SO2's presence, especially in environments where the concentration may be noticeable and has not reached hazardous levels.

While other methods like visible color change, sound detection, and weight measurement exist for various substances, they are not suitable for SO2 identification. SO2 is a colorless gas, making any visible color change impossible in most scenarios. Sound detection does not apply to this gas, as it is not characterized by any specific sound that would indicate its presence. Weight measurement, while useful in laboratory settings, is not a practical method for real-time detection of gases like SO2, as this would require specialized equipment to accurately ascertain its concentration in the air. Therefore, relying on the distinct sensory cues of odor and taste is the most straightforward and immediate method for identifying SO2 in many situations.