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The NIST document gives conversion factors correct to 7 places. Factors in bold are exact. If exact factors have more than 7 places, they are rounded and no longer exact. This convert module replaces these rounded figures with the exact figures. For example, the NIST document has 1 square mile = 2.589 988 E+06 square meters.
Energy densities table Storage type Specific energy (MJ/kg) Energy density (MJ/L) Peak recovery efficiency % Practical recovery efficiency % Arbitrary Antimatter ...
(MJ/kg) Energy density (MJ/L) Specific energy Energy density (W⋅h/L) Comment Antimatter: 89 875 517 874 ≈ 90 PJ/kg: Depends on the density of the antimatter's form 24 965 421 631 578 ≈ 25 TW⋅h/kg Depends on the density of the antimatter's form Annihilation, counting both the consumed antimatter mass and ordinary matter mass Hydrogen ...
List of conversion factors. ... × 10 −27 kg ... 1 ⁄ 100 of the energy required to warm one gram of air-free water from 0 °C to 100 °C at a pressure of 1 atm
The fuel consumption is an equivalent measure for cars sold outside the United States, typically measured in litres per 100 km traveled; in general, the fuel consumption and miles per gallon would be reciprocals with appropriate conversion factors, but because different countries use different driving cycles to measure fuel consumption, fuel ...
Hydrogen at atmospheric pressure has an energy density of 120 MJ/kg (113,738 BTU/kg), [88] by converting this energy density to a GGE, it is found that 1.011 kg of hydrogen is needed to meet the equivalent energy of one gallon of gasoline. This conversion factor can now be used to calculate the MPGe for this vehicle.
In all, the higher heating value of hydrogen is 18.2% above its lower heating value (142 MJ/kg vs. 120 MJ/kg). For hydrocarbons, the difference depends on the hydrogen content of the fuel. For gasoline and diesel the higher heating value exceeds the lower heating value by about 10% and 7%, respectively, and for natural gas about 11%.
This Wikipedia page provides a list of units of energy used in the template for converting measurements.