Investigation of the flammability characteristics of ammonia/water vapour/ air mixtures has shown that no aqueous solution of ammonia gives rise to flammable vapours when its temperature exceeds 49o C.

Can ammonia be explosive?

Although ammonia does not readily ignite (its flammability hazard is slight), sources of ignition such as smoking and open flames are prohibited where ammonia is used, handled, or stored in a manner that could create a potential fire or explosion haz- ard.

What causes ammonia to explode?

It dissolves easily in water to form ammonium hydroxide solution which can cause irritation and burns. Ammonia gas is easily compressed and forms a clear, colorless liquid under pressure. ... Ammonia is not highly flammable, but containers of ammonia may explode when exposed to high heat.