Ameer Randolph
Gasoline, or petrol, is a transparent, yellowish, and flammable liquid that is used to fuel cars. It is a mixture of hydrocarbon molecules, primarily octane, and is derived from the fractional distillation of petroleum. Gasoline is injected into the engine's cylinders, where it is combined with air and ignited by a spark plug. The combustion of gasoline produces carbon dioxide and water as exhaust. The performance specifications of gasoline vary with the season, with less volatile blends being used during the summer to minimize evaporative losses. The type of gasoline used in a car is important, as using the wrong fuel can damage the engine. Alternative fuels for cars include diesel, biodiesel, liquefied petroleum gas, compressed natural gas, liquid nitrogen, and electricity.
What is in the gas that fuels my car?
| Characteristics | Values |
|---|---|
| Name | Gasoline (North American English) or Petrol (Commonwealth English) |
| Composition | Mixture of hydrocarbon molecules, including octane |
| Physical State | Transparent, yellowish, and flammable liquid |
| Energy Content | 132 megajoules of energy per gallon |
| Energy Density | More than 40 megajoules per kilogram |
| Octane Rating | Varies, commonly 87, 89, and 91 |
| Alternative Fuels | Diesel, Biodiesel, E85 (blend of 15% gasoline and 85% ethanol), Liquefied Petroleum Gas, Compressed Natural Gas, Liquid Nitrogen |
| Storage Requirements | Airtight container, stable cool temperature |
| Combustion Process | Combines with air and ignites with spark from spark plug |
| Exhaust | Carbon dioxide and water |
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What You'll Learn
- Gasoline, a refined petroleum distillate, is the most common car fuel
- Diesel, another fuel option, is more expensive but allows for longer drives
- Electric cars are gaining popularity and run on electricity
- Octane ratings refer to how resistant a fuel type is to combustion by pressure
- Alternative fuels include biodiesel, liquefied petroleum gas, and compressed natural gas
Gasoline, a refined petroleum distillate, is the most common car fuel
The process of refining crude oil to produce gasoline involves fractional distillation, which breaks down heavier hydrocarbons to increase the percentage of lighter products. This results in a homogeneous mixture of hydrocarbons with between four and twelve carbon atoms per molecule. The performance specifications of gasoline vary seasonally, with less volatile blends being necessary during the summer to minimize evaporative losses.
The quality of gasoline is measured by its octane rating, which indicates its resistance to premature ignition or "knocking." Premature ignition occurs when the gas ignites before the spark plug fires, causing a rattling or knocking sound. Tetraethyl lead was once used to increase the octane rating, but due to health hazards, it is no longer used in automotive gasoline.
In some countries, such as Brazil, gasoline for automobile use is required to contain a certain percentage of ethanol, which can improve engine performance and reduce emissions. However, the specific requirements vary across countries.
While gasoline is the most common car fuel, there are alternative fuel options available, such as diesel, biodiesel, liquefied petroleum gas, compressed natural gas, and liquid nitrogen. Additionally, the popularity of electric cars is growing, offering a fuel-free alternative to traditional gasoline-powered vehicles.
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Diesel, another fuel option, is more expensive but allows for longer drives
Most cars run on gasoline, a refined petroleum distillate. However, diesel is another fuel option. Diesel is a type of fuel obtained from crude oil. It is more expensive than gasoline but allows for longer drives. Diesel fuel is denser than regular fuel and only works in vehicles designed to run on it. If you use gasoline in a diesel engine, damage will likely occur as gasoline does not ignite properly and burns too quickly, resulting in a very low power output. Many heavy-duty vehicles, including trucks, are equipped with a diesel engine and require the use of diesel fuel.
The reason diesel is more expensive than gasoline is due to a variety of factors. Firstly, the federal excise tax for on-highway diesel fuel is higher than the tax on gasoline. Additionally, in 2006, the U.S. began to phase in ultra-low-sulfur diesel (ULSD) to reduce the production of compounds like sulfur dioxide during the combustion of high-sulfur fuels, which can cause respiratory problems and acid rain. To meet the new ULSD standards, refineries had to invest in new equipment, which increased the cost of producing diesel fuel.
Another factor affecting the price of diesel is supply and demand. While U.S. diesel demand has slightly decreased since 2007, sanctions on Russia, a major supplier of diesel to the U.S., have also impacted diesel supplies. Additionally, Brazil, a major consumer of American diesel, has shifted to importing diesel from Russia due to lower costs. These factors have caused a substantial disruption to U.S. refiners and contributed to the higher price of diesel.
It is important to note that there are alternative fuels available, such as E85, a blend of 15% gasoline and 85% ethanol, which is less expensive than gasoline but results in lower miles per gallon. Other alternative fuels include liquefied petroleum gas, compressed natural gas, and liquid nitrogen, although most vehicles are not built to accept these fuels. Electric cars are also gaining popularity and run on electricity rather than gas.
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Electric cars are gaining popularity and run on electricity
The majority of cars run on gasoline, a refined petroleum distillate. However, electric cars are gaining popularity and run on electricity. Electric vehicles (EVs) are key to decarbonizing road transport, which accounts for over 15% of global energy-related emissions. In 2023, electric cars accounted for 18% of total car sales, and this figure is expected to rise to over 20% in 2024.
While electric cars are generally more expensive upfront, they have lower maintenance costs and are more fuel-efficient, resulting in overall cost savings. This is especially true when fuel prices are high. Additionally, electric vehicles produce fewer greenhouse gas emissions than internal combustion engine vehicles, making them an environmentally friendly alternative.
The growth in electric car sales has been driven by factors such as improved range, wider model availability, and increased performance. National policies, incentives, and increasing price competition have also contributed to the increasing demand for electric vehicles. For example, in Norway, government incentives and efforts to promote EVs have resulted in 80% of passenger vehicle sales being electric in 2022.
While electric cars are gaining traction, they are not yet a global phenomenon. Sales in developing and emerging countries have been slower due to higher purchase costs and a lack of charging infrastructure. However, with continued advancements and policy support, electric cars are expected to play a significant role in reducing carbon emissions and achieving net-zero emissions targets by 2050.
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Octane ratings refer to how resistant a fuel type is to combustion by pressure
Knocking, also known as self-ignition, occurs when rising temperature and pressure from the primary combustion cause unburned fuel to ignite. This uncontrolled secondary combustion causes pressure in the cylinder to spike, resulting in a knocking sound and potential damage to pistons and engines. Most modern engines have sensors to detect knocking, and computer systems can delay the initial spark to reduce knocking to an acceptable level.
The standard method for testing octane ratings involves using an octane testing engine. Primary Reference Fuels (PRF) of known octane levels are formed by combining iso-octane, heptane, and other standards. These PRFs are used to determine the pressure at which similar knock intensities are observed by adjusting the cylinder height and compression ratio/pressure. The octane number on fuel labels is the average of two different octane rating methods: the motor octane rating (MOR) and the research octane rating (RON).
The octane requirement of an engine depends on various factors, including the compression ratio, geometrical and mechanical considerations, and operating conditions. Aircraft engines, for example, typically run at relatively low speeds and perform best with lower-octane, slower-burning fuels. In contrast, air-cooled engines may use high-octane fuel as it is more easily vaporized and reduces the tendency for carburetor icing.
It is important to use the right fuel type and grade for your vehicle, as using the wrong fuel can potentially harm the engine. Gasoline, diesel, and alternative fuels such as E85 (a blend of gasoline and ethanol) are among the fuel options available at gas stations.
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Alternative fuels include biodiesel, liquefied petroleum gas, and compressed natural gas
Most cars run on gasoline, a refined petroleum distillate. However, with growing concerns about the environment, alternative fuels are becoming increasingly popular. These include biodiesel, liquefied petroleum gas, and compressed natural gas.
Biodiesel is a renewable, clean-burning fuel that is based on natural oils derived from domestic, renewable resources such as vegetable oils, animal fats, or recycled cooking grease. It contains no petroleum, but it can be blended with petroleum diesel to create a biodiesel blend. Biodiesel is simple to use, biodegradable, non-toxic, and essentially free of sulfur and aromatics. It can be used in compression-ignition (diesel) engines with little or no modifications and releases fewer pollutants than conventional diesel.
Liquefied petroleum gas (LPG) is a fossil fuel that is widely used as an alternative to conventional liquid automobile fuels. LPG has been used in vehicles for decades and is readily available. LPG vehicles can use both renewable and non-renewable LPG.
Compressed natural gas (CNG) is another clean-burning alternative to conventional liquid automobile fuels. It is a gaseous form of natural gas, including biomethane, and can be used in renewable and non-renewable forms. CNG is a domestically abundant fuel that can have significant cost advantages over gasoline and diesel fuels.
Alternative fuels are intended to substitute for more carbon-intensive energy sources like gasoline and diesel, contributing to decarbonization and reductions in pollution. They can also reduce non-carbon emissions such as nitric oxide, nitrogen dioxide, and sulfur dioxide.
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Frequently asked questions
Gasoline is a mixture of molecules that we use as car fuel. It is rich in octane but also contains other hydrocarbon molecules.
Ethanol is added to gasoline to increase its octane rating and reduce emissions.
Aside from gasoline, other types of fuel include diesel, biodiesel, E85 (a blend of 15% gasoline and 85% ethanol), liquefied petroleum gas, compressed natural gas, and liquid nitrogen.
