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The freezing point is the highest temperature at which Shi Yang can cool a substance under specified conditions until it stops flowing, and it is expressed in °C. Petroleum products are complex mixtures of various hydrocarbons, each of which has its own freezing point. Therefore, oils are not uniform single substances and have a certain freezing point. When the temperature drops, the oil does not solidify immediately; rather, it goes through a thickening phase before gradually solidifying over a fairly wide range of temperatures. The freezing point of oil is merely an approximate maximum temperature at which the oil loses its fluidity. The freezing point of oils is a value obtained through conditional tests; therefore, it must be determined under strict testing conditions. The standard test method in our country is GB/T510 \"Method for Determining the Freezing Point of Petroleum Products\". What is the significance of determining the freezing point of petroleum products? For waxy oils, the higher the wax content in the oil, the easier it is for it to solidify, and the higher its freezing point becomes. Therefore, to some extent, the freezing point can be used as an indicator to estimate the wax content in oils. The grade of light diesel is indicated by its freezing point. The freezing point is an important indicator of the low-temperature performance of petroleum products. Since the freezing point of petroleum products differs from the temperature at which they actually lose their fluidity, the temperature during transportation and use must be at least 3°C higher than their freezing point to ensure that the products remain in a fluid state.