Theoretically speaking Ammonia can exist both in Gas and as liquid form. It may be a Gas at room Temperature. you can produce it in a lab or it can be a bye product in many industrial process. Ammonia perhaps is the only Gas which can be liquified very easily at 20 degree C and 7.5 bar pressure. It is very easy to liquify it due to the strong hydrogen bondage between molecules.
So Liquid Ammonia is the preferred mode of storage , handling , transportation by Road tankers , rail & ships. Ammonia liquid transport by road tricks /tankers known to men since 100 years due to its utility as fertiliser to produce DAP and urea.
So, Ammonia is popularly known in its liquid form.
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