Question

whats the easiest way to identify ammonia

Answer 1

ammonia, is a colourless gas with a characteristic pungent smell

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Answer 2

Existing detectors include infrared gas analysers, ion-selective electrodes, detectors based on semiconductor films, or sensors that depend on ammonia’s reaction with an acidity-sensitive dye.
using ferrimagnetic nanofluids as sensors that reflect bluer light when exposed to more of the colourless gas.

Change of colour