Colorimetric tubes are __________.

• A. Gas-Specific, Used to Test for Gases in Hazardous Spills
• B. Temperature-Sensitive Detectors
• C. Water Quality Test Strips
• D. Smoke Detectors

Answer: (A)

Colorimetric tubes are designed for specific gases, making them gas‑specific detectors used for quick, on-site testing of hazardous spills. They work by drawing air through a glass tube containing a chemical reagent; the targeted gas reacts with the reagent and produces a color change along the tube. The extent of that color change corresponds to the concentration of the gas, with each tube calibrated for a particular gas (like chlorine, ammonia, or hydrogen sulfide). This specificity and field portability are what make them the right choice for detecting gases in spills. They aren’t temperature sensors, water quality strips, or smoke detectors, which are used for different measurement purposes.