Liquefied gases are called by cooling and compression liquid gas, which either with normal pressure on account of the Verdampfungsenthalpie with corresponding warm isolation coldly and fluidly pass. e.g., oxygen tanks and nitrogen tanks or to remain liquid under pressure stand, e.g., propane / butane in lighters, in camping gas cylinders, in liquid gas tanks for heating purposes.

In the narrower sense one understands by liquid gas collective farm (Liquified paraffin gas) – i.e. propane; butane and their mixtures which remain liquid with ambient temperature under relatively low pressure, hence, also Low Pressure gas are called and are used as a fuel for engines in vehicles. The mixing gas is also called liquefied petroleum gas or fuel gas.