What is the difference between propane and liquefied gas?

Propane and liquefied gas are very different in composition, price and use. First of all, from the perspective of composition, propane is a single gas. When pure propane is burned, no black smoke is emitted, and the flame is light blue. However, liquefied gas is a mixed gas composed of various gases such as butane, ethane, propane, butene, etc., mainly butane, and the flame color is red during combustion. In terms of price, propane, as a relatively pure gas, is difficult to extract and the cost is relatively high. However, liquefied gas is a mixed gas, which does not require much cost for purification, so the cost is relatively low. In terms of use, liquefied gas is mainly used as petrochemical raw materials, usually for cooking, heating and industrial fuel. However, propane is not used in this way due to its high price and cost. It is often used as a fuel for baking skewers, portable cookers and motor vehicles.