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Propylene and propane are common hydrocarbons with significant differences in their chemical structure and physical properties. Propylene and propane are both hydrocarbon compounds composed of carbon and hydrogen elements, with carbon atoms connected in different ways@@ Propylene refers to a compound composed of three carbon atoms and six hydrogen atoms, with a molecular formula of C3H6. Propane is a compound composed of three carbon atoms and eight hydrogen atoms, with the molecular formula C3H8. It can be seen that propane molecules contain more hydrogen atoms. Due to the presence of a double bond in propylene and the absence of a double bond in propane, the alkyl group of propylene is unsaturated, while propane is saturated@@ There are also differences in the physical properties of propylene and propane. Propylene is a colorless gas with low boiling and melting points, and high flammability. Propane is a colorless gas or liquid that is prone to liquefaction at room temperature. Propane has a higher boiling and melting point than propylene, and is more stable and less flammable than propylene@@ In addition, propylene and propane also have different uses. Propylene is an important chemical raw material, widely used in the manufacturing of plastics, fibers, rubber and other products. It is also used as a fuel gas and solvent. Propane is mainly used as gas and is widely used in household and industrial fields, such as heating, cooking, and power generation@@ Due to the different chemical structures and physical properties of propylene and propane, they have different advantages in their respective application fields. The unsaturated structure of propylene enables it to undergo various chemical reactions, making it widely applicable in the field of chemical engineering. Propane, on the other hand, plays an important role in the gas industry due to its low stability and flammability@@ Summary: Propylene and propane are two common hydrocarbons, with significant differences in their chemical structures and physical properties. Propylene is an unsaturated compound with high chemical activity and is widely used in the chemical industry; Propane is a saturated compound with high stability and is widely used in the field of gas. Understanding their differences helps us better understand and utilize their characteristics.