What percentage of Ammonia in the air is considered flammable?

Ammonia is a compound that can form flammable mixtures with air within a certain concentration range. The flammability limits of ammonia are usually recognized to be around 15% to 28% by volume when mixed with air. This means that if the concentration of ammonia in the air falls between these percentages, it has the potential to ignite in the presence of an ignition source.

Understanding these limits is critical for safety in environments where ammonia is used or handled, as operating within or close to these concentrations requires specific precautions to prevent accidents. The correct answer reflects the scientifically established flammable range for ammonia, crucial knowledge for anyone working in fields related to chemical handling and safety.