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Services About ROTH Jobs and careers Log in Home page Services Liquefied petroleum gas What is liquefied petroleum gas? What is liquefied petroleum gas? Liquefied gas consists of propane or butane - i.e. exclusively of hydrocarbons. The term liquefied gas is not a contradiction in terms, as the actually gaseous liquefied gas liquefies under a relatively low overpressure. It then only takes up 1/260 of the previous volume. So it can be transported in relatively small and light pressure vessels. However, in order to rule out the dangers that any form of energy brings with it, there are regulations that system manufacturers and consumers must adhere to.