I always found the acronym LPG (Liquefied Petroleum Gas) funny for similar reasons. The definition of the difference between gas and vapour is that a gas canno

I always found the acronym LPG (Liquefied Petroleum Gas) funny for similar reasons. The definition of the difference between gas and vapour is that a gas cannot be liquefied by pressure (so water vapour heated over ~374°C becomes a gas)