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Jet fuel is a mixture of various hydrocarbons, with a standard average density of 0.8 used for volume-to-mass conversions. Jet fuel weight calculations depend on the specific gravity (SG) of the fuel. For example, 1 litre of jet fuel with an SG of 0.780 would weigh 780 grams, while another jet fuel with a higher SG would have a correspondingly higher weight per litre. The weight of jet fuel is important in aviation, as it contributes to the overall weight of an aircraft and impacts its performance and range.
| Characteristics | Values |
|---|---|
| Density | 0.8 kg/l or 6.7 lb/USgal |
| Composition | Mixture of various hydrocarbons |
| Molecular mass | Defined by requirements for the product, such as freezing or smoke point |
| Carbon number distribution | Kerosene-type jet fuel: 8-16 carbon atoms per molecule; Wide-cut or naphtha-type jet fuel: 5-15 |
| Examples | Jet A, Jet A-1, Jet B, JP-4, JP-5, JP-8 |
| Standards | ASTM International (US civilian fuel types), U.S. Department of Defense (US military fuel types), British Ministry of Defence (UK civil and military jet fuels) |
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What You'll Learn
Jet fuel density
The density of jet fuel varies depending on its type. Jet A-1 fuel has a density of between 775.0 and 840.0 kg/m3, while Jet A fuel has a density ranging from 6.46 to 6.99 lbs/gallon at 60°F. Jet B, a naphtha-kerosene fuel, has a lighter composition that makes it more dangerous to handle and is therefore rarely used outside of very cold climates.
Jet fuel is a mixture of various hydrocarbons, and its composition varies based on the petroleum source. Because of this variation, jet fuel is defined by its performance specifications rather than as a chemical compound. The range of molecular mass between hydrocarbons is determined by the requirements of the product, such as its freezing or smoke point.
The most commonly used jet fuels for commercial aviation are Jet A and Jet A-1, which are produced according to standardized international specifications. Jet B is the only other jet fuel commonly used in civilian turbine-engine aviation due to its enhanced cold-weather performance.
Kerosene-type jet fuels, including Jet A and Jet A-1, have a carbon number distribution between about 8 and 16 carbon atoms per molecule. Wide-cut or naphtha-type jet fuels, including Jet B, have a carbon number distribution between about 5 and 15.
The density of jet fuel has a significant impact on its capacity. For example, a variation in world fuel density can cause the GV's maximum fuel capacity to change by more than 5,000 lbs. The density of jet fuel is influenced by the quality of the crude oil used and the refining process.
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Jet fuel weight calculation
To calculate the weight of jet fuel, you can use the formula:
Weight (in kilograms) = Volume (in litres) x Density (in kg/litre)
For example, if an aircraft carries 100,000 litres of jet fuel with a density of 0.8 kg/litre, the weight of the fuel would be:
100,000 litres x 0.8 kg/litre = 80,000 kilograms
It's important to note that jet fuel density can vary based on its specific composition, which differs depending on the petroleum source. Kerosene-type jet fuels, including Jet A and Jet A-1, have a carbon number distribution between about 8 and 16 carbon atoms per molecule. On the other hand, wide-cut or naphtha-type jet fuels, such as Jet B and JP-4, have a carbon number distribution between approximately 5 and 15.
Additionally, the density of jet fuel can be influenced by ambient temperature, which affects the volume of the fuel. However, the weight remains constant, as highlighted in discussions about sustainable aviation fuel (SAF) deployment, where metric tonnes are used for standardisation and to relate to the reduction in CO2 emissions, commonly measured in metric tonnes.
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Jet fuel volume to mass conversion
Jet fuel is a mixture of various hydrocarbons, with the exact composition varying based on the petroleum source. It is defined as a performance specification rather than a chemical compound. The range of molecular mass between hydrocarbons is defined by the requirements of the product, such as the freezing or smoke point.
Jet fuel is typically measured in litres or gallons, which are units of volume rather than mass. To convert volume to mass, a standard average density of 0.8 is used. This means that 1 litre of jet fuel, with a density of 0.8 kg/l, will weigh 0.8 kg. Therefore, 100,000 litres of jet fuel will weigh 80,000 kg or 176,370 lbs.
It is important to note that jet fuel does not have the same density as water. While 1 litre of water equals 1 kg, jet fuel has a lower density, typically around 0.780. This means that 1 litre of jet fuel at SG 0.780 equals 780 grams.
The weight of jet fuel is a critical consideration in aviation. Aircraft manufacturers use a density of jet fuel around 6.7 lb/USgal or 0.8 kg/l in performance calculations. The weight of the fuel impacts the maximum weight and range of the aircraft. Additionally, different types of jet fuel have different densities, such as Jet A and Jet A-1, which can affect the weight and volume of fuel required.
Overall, when converting jet fuel volume to mass, it is essential to consider the density of the specific type of jet fuel and use the standard average density of 0.8 for volume to mass conversions.
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Jet fuel types
Jet fuel, or aviation turbine fuel (ATF), is a type of aviation fuel used in aircraft with gas-turbine engines. It is a mixture of various hydrocarbons and is defined by its performance specifications rather than its chemical composition. The mass of jet fuel can vary depending on its density and temperature, but on average, one liter of jet fuel has a mass of around 0.8 kilograms. This average density of 0.8 is used for volume-to-mass conversions.
There are two main types of jet fuel: Jet A and Jet A-1 (also written as Jet A1). These fuels are kerosene-based and are the most commonly used in commercial aviation. Jet A is primarily used in the United States and a few Canadian airports, while Jet A-1 is the standard specification fuel used in the rest of the world, except for Russia and CIS members. Jet A and Jet A-1 have higher flash points than standard kerosene, with flash points above 38°C (100°F) and autoignition temperatures of 210°C (410°F). The main differences between the two fuels are that Jet A-1 has a lower freezing point (-47°C compared to -40°C for Jet A) and contains an antistatic additive. These characteristics make Jet A-1 suitable for long-haul international flights, especially those overflying polar routes.
Another type of jet fuel is Jet B, which is a naphtha-kerosene blend used for its enhanced cold-weather performance. Jet B has an extremely low freezing point of -60°C to -76°C, making it suitable for very cold climates like northern Canada and Alaska. However, its lighter composition makes it more flammable and dangerous to handle, so it is less commonly used.
In addition to these main types of jet fuel, there are other specialized fuels used in aviation. AVGAS, or aviation gasoline, is used in traditional propeller aircraft and small piston-engine planes for tasks like crop-dusting, private flying, and flight training. It has a high volatility and autoignition temperature to suit piston-engine requirements. Military aircraft may use specialized fuels like JP-5, JP-8, and TS-1, which have unique specifications such as anti-corrosion additives and modified freezing points for cold-weather operations.
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Jet fuel standards
Jet fuel, or aviation turbine fuel (ATF), is designed for aircraft powered by gas-turbine engines. The most commonly used jet fuels are Jet A and Jet A-1, which are produced according to an international specification. Jet B is another variety used for its enhanced performance in cold weather.
The standards and specifications for jet fuel vary between different countries and regions. In the United States, Jet A specification fuel has been used since the 1950s and is rarely available outside the US and select Canadian airports. Jet A-1, on the other hand, is the standard specification fuel used in most parts of the world, except Russia and the CIS members. These two types of jet fuel differ in their composition and performance characteristics. Both Jet A and Jet A-1 have a flash point higher than 38°C (100°F) and an auto-ignition temperature of 210°C (410°F).
In Russia and CIS members, jet fuel grades are covered by the State Standard (GOST) number or a Technical Condition number. The principal grade available is TS-1. The GOST standard also specifies civilian and military fuels, with civilian fuels including TS-1, T-1, T-1S, T2, and RT, and military fuels including T-1pp, T-8V (also known as T-8B), and T-6.
British and American jet fuel standards were initially established after World War II, with British standards derived from kerosene use in lamps, and American standards derived from aviation gasoline practices. Over time, these standards have been adjusted to balance performance requirements and fuel availability. The British Ministry of Defence sets the standards for both civil and military jet fuels, while in the US, ASTM International produces standards for civilian fuel, and the Department of Defense sets standards for military use.
To ensure inter-operational ability, British and US military standards are harmonized to a certain degree. Military organisations worldwide use a classification system of JP ("Jet Propellant") numbers, with some being very similar to their civilian counterparts, differing only in the amounts of certain additives.
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Frequently asked questions
Jet fuel is a mixture of various hydrocarbons, so its density can vary. However, a standard average density of 0.8 kg/litre is used for volume-to-mass conversions. Therefore, 1 litre of jet fuel weighs approximately 0.8 kg.
The density of jet fuel can vary depending on its exact composition, which differs based on the petroleum source. Jet fuel can be kerosene-type, naphtha-type, or a blend of kerosene and gasoline, each with its own density and performance characteristics.
The density of jet fuel is an important consideration in aircraft operations as it affects the weight and range of the aircraft. A lower density fuel may result in a lower maximum takeoff weight, while a higher density fuel can increase the aircraft's range. Additionally, the density of jet fuel can vary with ambient temperature, impacting the volume of fuel required.
