Volumetric energy density hydrogen. 7 MJ/L, than even liquid hydrogen, at 8. Thermophysical Properties of Fluid Systems Accurate thermophysical properties are available for several fluids. Hydrogen has a very low volumetric energy density compared to fossil fuels like gasoline or diesel, which means that a large volume of hydrogen is required to store the same amount of energy. Selected energy densities plot [2][3][4][5][6][7][8] For energy storage, the energy density relates the stored energy to the volume of the storage equipment, e. Download Table | Volumetric and gravimetric energy densities of common fuels. This significantly increases its volumetric energy density compared to gaseous hydrogen, but maintaining such low temperatures requires energy-intensive cryogenic systems and well-insulated storage tanks, adding complexity and cost. By Weight (Gravimetric Density) This is where hydrogen truly shines. 5 days ago · Modern battery packs deliver 0. . Feb 18, 2022 · LIQUID: Liquid Hydrogen provides the highest possible density: 71kg/m^3, which makes the volumetric energy density exactly double of what is possible at 350 bar: 8MJ/m^3, explaining the usage of Compressed hydrogen Compressed hydrogen (CH2) is stored at high pressures (150–700 bar) in a gaseous state. 5 times of liquid hydrogen, and it is easily liquefied Hydrogen - Density and Specific Weight vs. 07. Consequently, storing or using hydrogen at atmospheric pressure and temperature requires a substantial amount of space. Jun 12, 2020 · Ammonia is considered to be a potential medium for hydrogen storage, facilitating CO2-free energy systems in the future. While hydrogen excels in one, it struggles in the other, creating a trade-off that must be Nov 29, 2025 · Energy density, in its simplest terms, refers to the amount of energy stored in a given system or region of space per unit volume or mass. Ammonia is characterized by a volumetric energy density significantly higher than compressed natural gas at 250 bar, with gravimetric energy density more than halved with respect to fossil fuels Oct 11, 2017 · Here, MOFs that achieve high gravimetric and volumetric H 2 densities simultaneously are identified computationally, and demonstrated experimentally. For mobility applications, the key priority is to increase the volumetric energy density of the hydrogen storage system, while maintaining safety and ease of use. production distribution Specific volume (NTP) Specific heat at constant pressure, Cp (NTP) Specific heat at constant volume, Cv (NTP) Thermal conductivity (NTP) Viscosity (NTP) Notes: [1] NTP (normal temperature and pressure) = 20 oC (68 oF) and 1 atm; [2] Reference state: Internal Energy U=0 at 273. Ab initio molecular dynamics (AIMD) simulations further demonstrate thermal stability at 300 K up to 6 ps. 2 pounds, 2. 5 days ago · The calculated volumetric hydrogen storage capacity ranging around 90 /L indicates high hydrogen density. Mar 17, 2023 · Though storing hydrogen as a compressed gas is relatively energy efficient (91%) in both short-term and seasonal storage applications, it sacrifices some of the volume savings that high-density liquefied hydrogen enables. They do this without chemical conversion, without gas handling, and with round-trip efficiencies of 85% to 95%. As the lightest element in the Jun 4, 2021 · For mobility applications, the key priority is to increase the volumetric energy density of the hydrogen storage system, while maintaining safety and ease of use. Today, hydrogen is mainly used as a feedstock, intermediate chemical, or specialty chemical. Although the specific energy is more than twice that of other fuels, this gives it a remarkably low volumetric energy density, many fold lower. Gravimetric Energy Density is a constant where as volumetric energy density varies with pressure and state, temperature. For mobile and in many cases also for stationary applications the volumetric and gravimetric density of hydrogen in a storage material is crucial. Hydrogen also tends to cause embrittlement of steels used for pipelines, which reduces their lifetimes compared to their use for other gases. The chart above compares energy densities (both per unit volume and per unit weight) for several transportation fuels that are available throughout the United States. Hydrogen energy density essentially equates to how much energy a specific volume (volumetric energy density) or weight (gravimetric energy density) of this gas is able to produce when compared to other materials. The energy of a fuel per unit mass is called its specific energy. Online calculator, figures and tables showing density and specific weight of hydrogen, H2, at temperatures ranging from -260 to 325 °C (-435 to 620 °F) at atmospheric and higher pressure - Imperial and SI Units. Moreover, the desorption temperatures of these materials are within 233 to 333 K. Dec 6, 2020 · Therefore, the only way to compensate for the low volumetric energy density of hydrogen is to either compress the gas, liquefy it, or bond hydrogen into another substance. It focuses on studying the properties and characteristics of hydrog… Aug 16, 2019 · Hydrogen has a very large energy density on a mass basis, but the challenge is to improve on its volumetric energy density. 8 kilograms) of gasoline. It can be measured in gravimetric energy density (per unit of mass) or volumetric energy density (per unit of volume). 14 hours ago · The simultaneous combustion of hydrogen and CO resulted in the highest volumetric energy density among the three designs, leading to the largest pressure rise. 10). For hydrogen fuel cell vehicles, the weight compounding in not an issue. design and testing for improved volume density Composite tank testing B. While hydrogen possesses an exceptionally high gravimetric energy density, its volumetric energy density under standard conditions is Although hydrogen has a very high gravimetric energy density, its volumetric energy density is very low. This necessitates energy-intensive processing to condense it into a usable volume. Temperature and Pressure Online calculator, figures and tables showing density and specific weight of hydrogen, H2, at temperatures ranging from -260 to 325 °C (-435 to 620 °F) at atmospheric and higher pressure - Imperial and SI Units. Hydrogen calculator With our hydrogen calculator, you can determine crucial key parameters such as energy, weight and volume. g. Meaning → Hydrogen Energy Density refers to the quantity of chemical energy stored within a given mass or volume of hydrogen fuel, which is a crucial metric for determining its suitability as a viable energy carrier, particularly for mobile applications. The higher the energy density of the fuel, the more energy may be stored or transported for the same amount of volume. Feb 22, 2023 · E-methanol offers a solution. carrier The low volumetric density of gaseous fuels requires a storage method which compacts the fuel. H2 is an extremely light gas with low volumetric energy density. Hydrogen as a carbon-neutral energy carrier, is pivotal for decarbonizing sectors like transportation and industry. 3,4 Hydrogen Density, Energy Content or volumetric energy density at various pressure levels CGH2, Liquid Hydrogen LH2, Cryo Compressed Hydrogen CcH2. 2 pounds (1 kilogram) of hydrogen gas is about the same as the energy in 1 gallon (6. The subject of hydrogen storage has been As the lightest element, with low volumetric energy density, hydrogen is challenging to store and transport and for many practical uses needs to be compressed or liquefied. 14 hours ago · Blending, however, presents its own limitations. In contrast, the APR1400, despite releasing the largest total combustion energy, showed a mitigated pressure response due to its substantially larger containment free volume. 6 wt. While hydrogen excels in one, it struggles in the other, creating a trade-off that must be Volumetric energy density can be increased by storing the gaseous hydrogen under increased pressure or storing it at extremely low temperatures as a liquid. Nov 6, 2025 · The Practical Challenge of Storing Hydrogen While hydrogen excels in specific energy, its challenge lies in its low volumetric energy density. The adjacent figure shows the The volume-related (volumetric) energy density of hydrogen at atmospheric pressure, on the other hand, is quite low compared to the other known energy carriers. Research in this area Jan 1, 2024 · Solid-state hydrogen storage presents several advantages, including high volumetric and gravimetric energy density (depending on the material), safer storage due to reduced pressure requirements, and more compact storage options. Compression is a straightforward method for increasing the volumetric energy density for short periods of time for two key reasons. Biofuels include bioethanol, an alcohol made by fermentation —often used as a gasoline additive, and biodiesel, which is usually used as a Nov 2, 2022 · Ammonia has been expected as hydrogen and energy carriers because it has high gravimetric and volumetric H2 densities with 17. 5 MJ/l of hydrogen, liquefied at around -250°C, making it also easier to handle, transport and store. We would like to show you a description here but the site won’t allow us. A biofuel is a fuel produced from recently living organisms. But at low concentrations of Dec 8, 2021 · Using liquid hydrogen at minus 252. However, its ambient gaseous state (0. 7 MJ/l, in comparison to 8. %, based on its molecular structure. 8ºC – what does it really take? For the necessary 30,508 kg of hydrogen here, an overall energy requirement of 205,334 kWh (for grey hydrogen) or 1,242,385. When considering hydrogen, this definition becomes multifaceted, demanding we examine both volumetric and gravimetric energy densities. Hydrogen can also be adsorbed into metal hydrides and highly porous materials (Table 2 10 2. After compression, the volumetric energy density of hydrogen increases to 1800 MJ/m 3 at 200 bar and 4820 MJ/m 3 at 700 bar [90]. Ammonia has a higher energy density, at 12. 8 wt% and 10. Aug 17, 2023 · Hydrogen can be cooled to extremely low temperatures to become a liquid. ACS Publications Jun 5, 2024 · By changing the pressure, temperature or state of hydrogen, the volumetric mass density can be increased, resulting in a higher volumetric energy density. Aug 10, 2023 · Hydrogen low energy density is one of the challenges associated with hydrogen storage. Jan 16, 2025 · Gravimetric energy density (energy per unit mass) and Volumetric energy density (energy per unit volume). Mar 17, 2004 · The second difficulty with hydrogen as an energy carrier is its low critical temperature of 33 K (i. By compressing or liquefying hydrogen, it is possible to raise the low volumetric energy density. However, in order to release hydrogen from ammonia, significant energy input as well as reactor mass and volume are required. This study experimentally investigates hydrogen blending effects on diesel sprays under a 3 MPa backpressure using high-speed shadowgraphy in a constant-volume combustion chamber. As noted above, the onboard hydrogen storage system includes every component required to safely accept hydrogen from the delivery infrastructure, store it onboard, and release conditioned hydrogen to the fuel cell system. Hydrogen has the highest energy per mass of any fuel at 120 MJ/kg H₂ on a lower heating value basis, but very low volumetric energy density of 8 MJ/L for liquid hydrogen and 5. May 2, 2017 · Hence, it has become imperative to address hydrogen storage in a comprehensive manner. Apr 3, 2023 · Liquid hydrogen: Hydrogen can be liquified by cooling it to extremely low temperatures (-253°C or -423°F). 2 to 0. Jun 4, 2021 · For mobility applications, the key priority is to increase the volumetric energy density of the hydrogen storage system, while maintaining safety and ease of use. The volumetric energy density of compressed hydrogen, up to 700 bar, is around 5 MJ/L, while it is around 33MJ/L for gasoline [3, 4]. Currently, many people advocate a hydrogen economy, which will use hydrogen as an energy carrier or Online calculator, figures and tables showing density and specific weight of hydrogen, H2, at temperatures ranging from -260 to 325 °C (-435 to 620 °F) at atmospheric and higher pressure - Imperial and SI Units. This review describes the fundamental physical and chemical properties of hydrogen and basic theories of hydrogen sorption reactions, followed by the emphasis on state-of-the-art of the hydrogen storage properties of selected interstitial metallic hydrides and magnesium design and testing for improved volume density Composite tank testing B. Hydrogen has highest gravimetric energy density (see the table) being the primary reason for considering hydrogen as a strong contender, as an alternative among all types of fuels (excluding fossil fuels). 6 wt% of hydrogen, and when liquefied at around -33°C, has a relatively high volumetric energy density of 12. Feb 24, 2026 · Furthermore, whilst the energy density is quite high per unit of mass, it is relatively low per unit of volume – meaning it takes up a lot of space, not ideal for applications like aviation. 08988 g/L at STP) poses significant technical challenges due to ultra low volumetric energy density (∼3 Wh/L vs. Since hydrogen is produced at relatively lower pressures, it must be compressed before transportation. Hydrogen’s lower volumetric energy density and material compatibility challenges constrain blending ratios, while regulatory frameworks governing gas quality vary significantly across markets. Fortunately, there is a solution to this. However, its low volumetric density restricts its widespread use in transportation applications—as current storage options require a lot of space. 4 MJ/kg), as demonstrated by Figure 9. Liquid hydrogen has a much higher volumetric energy density than gaseous hydrogen, allowing for more efficient storage. Hydrogen has the highest energy per mass of any fuel; however, its low ambient temperature density results in a low energy per unit volume, therefore requiring the development of advanced storage methods that Hydrogen Density, Energy Content or volumetric energy density at various pressure levels CGH2, Liquid Hydrogen LH2, Cryo Compressed Hydrogen CcH2. Objective To achieve adequate stored energy in an efficient, safe and cost effective system. Volumetric energy density can be increased by storing the gaseous hydrogen under increased pressure or storing it at extremely low temperatures as a liquid. These two measurements reveal both hydrogen's greatest strength and its most significant practical challenge. 7kgH2/100L, respectively. The basic energy density of the hydrogen fuel cell system in watt hours per liter is compared with that of batteries in Figure 5. Under the optimal combustion condition (a 29% hydrogen-to-air volume ratio), the energy required to initiate hydrogen combustion is much lower than that required for other common fuels (e. Hydrogen calculators to help you: Calculate the mass of hydrogen, Convert between hydrogen mass and volume, Convert between hydrogen mass and the energy content. Furthermore, ammonia is also considered safe due to its high auto ignition temperature, low condensation While hydrogen has high energy density per unit mass, it has low-volumetric energy density at room conditions (around 30% of methane at 15 °C, 1 bar) and an ability to permeate metal-based materials, which can present operational and safety constraints. gasoline’s ∼9,500 Wh/L). 8 kWh (for green hydrogen) is required, including the liquefaction process. For this reason, hydrogen is stored in most applications at high pressures, in cars, for example, at around 700 bar. The hydrogen capacities of 5309 MOFs drawn from databases of known compounds were predicted using empirical (Chahine rule) correlations and direct atomistic simulations. The indicated challenges of hydrogen influence its use as a The energy content of biofuel is the chemical energy contained in a given biofuel, measured per unit mass of that fuel, as specific energy, or per unit of volume of the fuel, as energy density. Hence, hydrogen storage systems are inherently more complex than liquid fuels. The term energy density is used interchangeably with the term volumetric capacity. Despite hydrogen’s high specific energy per unit mass, with 120 MJ/kg as the lower heating value (LHV), its low energy density per unit volume (about 10 MJ/m 3) presents a challenge for achieving compact, cost-effective, and secure energy-dense storage solutions. 6 MJ/L for compressed hydrogen gas at 700 bar pressure, compared to 32 MJ/L for gasoline at ambient conditions. The volumetric storage density (H2-kg/m3) of hydrogen at 25oC can be calculated by 0. The energy in 2. 3 kWh per kg and similar volumetric density. , a small spark will ignite it), as shown in Figure 4. Hydrogen's flammability range (between 4% and 75% in air) is very wide compared to other fuels, as shown in Figure 3. Mar 21, 2025 · Hydrogen may be light by weight but storing it is inefficient and energy-intensive due to its low volumetric density and complex infrastructure needs. Feb 14, 2013 · The widespread use of these fuels is largely explained by their energy density and ease of onboard storage, as no other fuels provide more energy within a given unit of volume. However, NIST makes no warranties to that effect, and NIST shall not be Sep 20, 2022 · Hydrogen has the highest gravimetric energy density of all chemical fuels (141 MJ/kg), which is three times higher than gasoline (46 MJ/kg). Achieving such low temperatures requires expending significant energy. Dec 31, 2022 · However, hydrogen has a high gravimetric energy density, which means that it has a high amount of energy stored per unit of weight. The weight compounding limits the vehicle range until a new improvement in the battery development improves the energy density per Kg. Research in this area Learn more about fuel cells. This means that large volumes are required to store a small amount of energy compared to traditional fuels like gasoline or diesel, which have much higher volumetric energy densities (around 35 MJ/L). Aug 16, 2019 · Hydrogen has a very large energy density on a mass basis, but the challenge is to improve on its volumetric energy density. Hydrogen Analysis Resource Center Your Trusted Source for Hydrogen Analysis Data, Guidelines, and Tools Hydrogen Density at different temperatures and pressures. the fuel tank. This makes the storage, transportation, and application of hydrogen considerably easier. Notes Go To: Top Data from NIST Standard Reference Database 69: NIST Chemistry WebBook The National Institute of Standards and Technology (NIST) uses its best efforts to deliver a high quality copy of the Database and to verify that the data contained therein have been selected on the basis of sound scientific judgment. Energy density is the amount of energy that can be released by a given mass or volume of fuel. Long-distance transportation of hydrogen is one of the most challenging issues in the energy sector. Nov 28, 2024 · Volumetric Energy Density: Hydrogen at ambient temperature and pressure has a very low volumetric energy density of about 0. As the lightest element, hydrogen is a gas at standard temperature and pressure, making it extremely bulky. Compact hydrogen storage or efficient storage is critical for enabling practical applications Hydrogen has a gravimetric energy density of 120 MJ/kg, about 3 times the energy content of diesel (45. Gravimetric storage density: the gravimetric storage density is the weight of the hydrogen being stored divided by the weight of the storage and delivery system proposed Source: Oak Ridge National Laboratory Hydrogen Storage Work Shop, May 2003 Ammonia is regarded as an advantageous energy carrier as it contains 17. 85 kg/m 3 (at 20 K), a relative density of just 0. 5 MJ/L. In addition, refuelling of the vehicle takes much less time with hydrogen, compared with recharging. The density of liquid hydrogen is only 70. Liquid hydrogen has to be stored at cryogenic conditions of –253 °C, whereas ammonia can be stored at Feb 1, 2017 · Hydrogen may play a key role in a future sustainable energy system as a carrier of renewable energy to replace hydrocarbons. In order to really assess the impact of any zero-emission fuel on your operations, you must to look beyond the energy density of the fuel and consider the entire system needed to actually make the fuel power your application. 0807P, based on thermodynamics. The expression is derived from the ideal gas law, where P is the storage pressure in bars. Nov 2, 2022 · Ammonia has been expected as hydrogen and energy carriers because it has high gravimetric and volumetric H2 densities with 17. Ammonia is characterized by a volumetric energy density significantly higher than compressed natural gas at 250 bar, with gravimetric energy density more than halved with respect to fossil fuels Nov 18, 2021 · The gravimetric energy density of a hydrogen tank in a car or truck is much lower than a tank containing liquid petroleum fuel. Aug 1, 2024 · Even in this condensed state, the volumetric energy density of liquid hydrogen remains lower than conventional jet fuel by a factor of approximately 4. Because hydrogen has a low volumetric energy density, it is stored onboard a vehicle as a compressed gas to achieve the driving range of conventional vehicles. However, the cryogenic temperatures required for liquefaction present challenges regarding energy consumption and maintaining low-temperature conditions. 5 times of liquid hydrogen, and it is easily liquefied Dec 9, 2025 · To really understand how hydrogen works as a fuel, we need to look at it from two different angles: its energy content by weight (gravimetric density) and by volume (volumetric density). The hydrogen system has an inherent advantage in basic energy density. The current traditional methods of storage for hydrogen include pressurized gas and cryogenic compression which both have intrinsic issues such as safety concerns, low volumetric density, and boil Another very important physical property is energy density, which can be measured in two ways: gravimetric and volumetric. Its high volumetric hydrogen density, low storage pressure and stability for long-term storage are among the beneficial characteristics of ammonia for hydrogen storage. from publication: Hydrogen as an energy carrier: Prospects and challenges | This paper provides an insight to the Hydrogen storage is a key enabling technology for the advancement of hydrogen and fuel cell technologies in applications including stationary power, portable power, and transportation. 3,4 Mar 21, 2025 · Hydrogen may be light by weight but storing it is inefficient and energy-intensive due to its low volumetric density and complex infrastructure needs. The gravimetric energy density of a fuel tank depends on the tank’s size; bigger tanks have a higher energy density. Oct 27, 2022 · Hydrogen, which possesses the highest gravimetric energy density of any energy carrier, is attractive for both mobile and stationary power, but its low volumetric energy density poses major Sep 5, 2024 · Whilst hydrogen has a remarkably high gravimetric density (as discussed above), it has a relatively low volumetric density, which is the amount of available energy in a given volume. The volumetric hydrogen density is above 1. Learn more about fuel cells. But this advantage is amplified on a vehicle as a result of weight compounding. The low volumetric energy density of hydrogen can be a challenge for its use as an energy storage medium, particularly for portable applications where weight and size are important considerations. 6 MJ/kg) and gasoline (46. Odegard, SNL comparison of high pressure hydrogen tank failure to other fuels. Sep 15, 2024 · This paper discusses the use of hydrogen in various industries and energy sectors. Storage technologies are needed in all aspects of hydrogen utilization. Green ammonia is produced using renewable energy sources like solar and wind, combining green hydrogen with nitrogen from the air. The two most common methods of pure hydrogen storage are compressed hydrogen gas and liquid hydrogen. 16 K for saturated liquid; Entropy S=0 at 273. These data include the following: Jan 13, 2026 · CK-12 Chemistry for High School FlexBook® covers core chemistry concepts and includes SIMs, PLIX, real world examples, and videos. hydrogen is a gas at ambient temperature). CNG, gasoline, methanol. Ammonia has a number of favorable attributes, the primary one being its high capacity for hydrogen storage, 17. The US hydrogen industry produces nine million tons of hydrogen per year for use in chemical production, petroleum refining and electrical applications. 16 K for saturated liquid. e. Jul 23, 2025 · Understand hydrogen’s energy density—why it’s energy-rich by weight, but needs special storage due to its low volume. To achieve this, a number of different technologies have been proposed, with the main goal being to design a hydrogen storage system that is affordable, sustainable, safe, and one in which hydrogen can be easily and quickly charged and discharged. The large storage volumes required for cryogenic liquid hydrogen present difficulties in terms of vehicle design and performance for aerospace applications. 01 MJ/L. Although molecular hydrogen has very high energy density on a mass basis, partly because of its low molecular weight, as a gas at ambient conditions it has very low energy density by volume. iqzrwkv dweans ifcnhs pwdt fofaz kexxye kaa gksbzpbe vhq xfdw