Which instrument is best for detecting N2O in the air?

Infrared spectrophotometry is considered the best instrument for detecting nitrous oxide (N2O) in the air because it takes advantage of the unique absorption characteristics of N2O in the infrared spectrum. Different gases absorb infrared radiation at specific wavelengths, and for N2O, there are particular wavelengths where it absorbs strongly. By measuring the intensity of infrared light that passes through a sample of air, the concentration of nitrous oxide can be determined with high sensitivity and specificity.

This method allows for real-time analysis of air samples and is widely used in various environments, such as hospitals and laboratories, where monitoring of nitrous oxide levels is critical for safety and compliance purposes. Unlike some other methods, infrared spectrophotometry does not rely on chemical reactions or require samples to be taken away for separate analysis, making it efficient for continuous monitoring.

The other options presented do not provide the same level of specificity or capability for detecting N2O in the air as infrared spectrophotometry does. Nitrous oxide dosimetry involves specific techniques for measuring exposure over time, which may not be as effective for immediate detection. A balloon filled with water is not a suitable method for gas detection, as water cannot absorb N2O. Lastly, while an