Natural gas, either in liquefied form (LNG) or compressed (CNG), are lighter than gasoline but again have lower densities per unit volume. The same is true for hydrogen fuels, which must be either cooled (down to -253 o C) or compressed (to 3,000 to 10,000 psi). The problem with hydrogen is that it is much less dense (pounds per gallon) than other fuels. Myth 4 – Hydrogen has a higher energy density than gasoline or diesel Hydrogen has more energy per unit mass than other fuels (61,100 BTUs per pound versus 20,900 BTUs per pound of gasoline). The energy density of a fuel per unit mass is called the specific energy of that fuel. Energy carrier Form of Storage Energy density by weight [kWh/kg] Energy density by volume [kWh/l] Hydrogen: gas (20 MPa) 33.3: 0.53: gas (24,8 MPa) 33.3: 0.64: gas (30 MPa) 33.3: 0.75: liquid (-253°C) 33.3: 2.36: metal hydride: 0.58: 3.18 In energy storage applications the energy density relates the energy in an energy store to the volume of the storage facility, e.g. In general an engine using that fuel will generate less kinetic energy due to inefficiencies and thermodynamic considerations—hence the specific fuel consumptionof an engine will al… The higher the energy density of the fuel, the more energy may be stored or transported for the same amount of volume. the fuel tank. This means that if it is released in an open environment, it will typically rise and disperse rapidly. Hydrogen is about 57 times lighter than gasoline vapor (as shown in Figure 1) and 14 times lighter than air.

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