Fuel properties refer to the characteristics that determine how a fuel behaves during combustion. Key properties include energy content, which indicates how much energy can be obtained from a specific amount of fuel, and ignition temperature, the minimum temperature required for combustion to occur. Other important properties are viscosity, which affects how easily a fuel can flow, and volatility, which influences how readily a fuel vaporizes. Different types of fuels, such as gasoline, diesel, and biofuels, have unique properties that make them suitable for various applications. For instance, gasoline has a high volatility, making it ideal for use in internal combustion engines, while diesel has a higher energy content and is commonly used in larger vehicles. Understanding these properties helps in selecting the right fuel for specific needs.