Question

why can we get the smell of gas leakage sitting meters away?

Answer 1

since lpg contains mercaptan, a gas which is used to detect leakage of gas, so we are able to small gas leakage

Answer 2

This is because the particles of gas 're loosely bounded which may allow the gas particles move freely. This is reason we 're able to smell the leakage of gas from a distance.

Hope it helps...