the density of gasoline is .7 to .78g/cm? .

gasoline, a volatile and combustible hydrocarbon mixture liquid, can be used as fuel. Appearance is transparent liquid, flammable, distillation range is 3℃ to 22℃, density is .7 to .78g/cm? The main components are C5 ~ C12 aliphatic hydrocarbons and cycloalkanes, and a certain amount of aromatic hydrocarbons.

gasoline has a high octane number (anti-knock combustion performance), and is divided into grades 89, 9, 92, 93, 95, 97 and 98 according to the octane number. Since January 212, gasoline grades 9, 93 and 97 have been changed to 89, 92 and 95.

gasoline brands

There are three gasoline brands in China (IV), namely 9, 93 and 97. Countries (V) are No.89, No.92 and No.95 respectively (No.98 is included in the appendix). The selection of gasoline is mainly based on the requirements of the automobile instruction manual, and the appropriate brand of automobile gasoline is selected on the premise that the engine does not deflagrate under normal conditions.

The traditional emphasis on choosing gasoline according to the compression ratio has become increasingly blurred, because there are other factors that affect the engine deflagration besides the compression ratio, and the structure of today's automobile engine is becoming more and more perfect. The electronic control system can automatically adjust the ignition advance angle, so that the ignition advance angle of the engine can work at the optimal value and knock is eliminated.

above content reference: Baidu encyclopedia-gasoline