Question

which property of gases help us to detect leakage of LPG

Answer 1

The property which helps us to detect LPG is the molecules that expand in the air.

Answer 2

LPG has the property to diffuse in the surroundings and as it diffuses we can detect its presence by its smell also it is combustible so if a large amount of gas has been spread in the air in the room even a small spark can lead to a large disaster.