Explain the following observations
Liquid ammonia bottle is cooled before opening the seal

Explanation

Liquil ammonia bottle is cooled before opening the seal :
At room temperature, vapour pressure of liquid ammonia is very high and so will evaporate. If the bottle is opened, the sudden decrease in pressure will lead to increase in volume of the gas and cause breakge of the bottle. Cooling decreases the vapour pressure and maintains the liquid in the same state. Hence, the bottle is cooled before opening.