Question

Why are gaseous fuels (at room temperature) such as propane and butane condensed and stored as liquids under pressure?

Answer 1

Butane and propane is strored as liquids because we can store more volume of gas in form of liquid rather than in the form of gas. As we know in gaseous state it occupies more space and we can not carry in bulk for any use.To overcome that problem we strore them in form of liquid.

When pressure is apllied on any of gas their molecules have less space to occupy so its phase is converted into liquid state. When pressure is apllied their boiling point also increases than their original boiling point and due to that propane and butane which is actually gas is converted into liquid under pressure.