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This is an extended version of the energy density table from the main Energy density page: ... Water 220.64 bar, 373.8 °C [citation needed] [clarification needed]
The higher the energy density of the fuel, the more energy may be stored or transported for the same amount of volume. The energy of a fuel per unit mass is called its specific energy. The adjacent figure shows the gravimetric and volumetric energy density of some fuels and storage technologies (modified from the Gasoline article).
Methane is easier to store than hydrogen due to its higher boiling point and density, as well as its lack of hydrogen embrittlement. [ 31 ] [ 32 ] The lower molecular weight of the exhaust also increases the fraction of the heat energy which is in the form of kinetic energy available for propulsion, increasing the specific impulse of the rocket.
For the purpose of comparison of different fuels, the heating value may be expressed in terms of energy per volume, which is known as the energy density expressed in MJ/litre. The density of LNG is roughly 0.41 kg/litre to 0.5 kg/litre, depending on temperature, pressure, and composition, [3] compared to water at 1.0 kg/litre. Using the median ...
A Assuming an altitude of 194 metres above mean sea level (the worldwide median altitude of human habitation), an indoor temperature of 23 °C, a dewpoint of 9 °C (40.85% relative humidity), and 760 mmHg sea level–corrected barometric pressure (molar water vapor content = 1.16%). B Calculated values *Derived data by calculation.
However, water has a very high volumetric heat capacity, at 4.18 MJ⋅K −1 ⋅m −3, and ammonia is also fairly high: 3.3 MJ⋅K −1 ⋅m −3. For gases at room temperature, the range of volumetric heat capacities per atom (not per molecule) only varies between different gases by a small factor less than two, because every ideal gas has ...
A simple 52-gallon electric water heater can store roughly 12 kWh of energy for supplementing hot water or space heating. [ 92 ] For purely financial purposes in areas where net metering is available, home generated electricity may be sold to the grid through a grid-tie inverter without the use of batteries for storage.
The vibrational and electronic degrees of freedom do not contribute significantly to the heat capacity in this case, due to the relatively large energy level gaps for both vibrational and electronic excitation in this molecule. This value for the specific heat capacity of nitrogen is practically constant from below −150 °C to about 300 °C.