Engineering Homework Help

I’m working on a chemical engineering discussion question and need an explanation to help me learn.

Liquids that boil at relatively low temperatures are often stored as liquids under their vapor pressure which at ambient temperature can be quite large. Thus, n-butane stored as a liquid/vapor system is at a pressure of 2.581 bar for a temperature of 300K. Large scale storage (>50m3) of this kind is sometimes done in spherical tanks. Give two reasons why