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The watt, kilogram, joule, and the second are part of the International System of Units (SI). The hour is not, though it is accepted for use with the SI.Since a watt equals one joule per second and because one hour equals 3600 seconds, one watt-hour per kilogram can be expressed in SI units as 3600 joules per kilogram.
(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 ...
Wh Wh 1.0 Wh (3.6 kJ) W.h (W·h, W-h) ... Cal-15 (kg-cal-15) Cal 15: 1.0 ...
MJ/kg (Wh/kg) MJ/L (Wh/L) W/kg Wh/$ ($/kWh) % %/month years Lead–acid: SLA VRLA PbAc Lead: H 2 SO 4: Lead dioxide: Yes 1881 [1] 1.75 [2] 2.1 [2] 2.23–2.32 [2] 0.11–0.14 (30–40) [2] 0.22–0.27 (60–75) [2] 180 [2] 5.44–13.99 (72–184) [2] 50–92 [2] 3–20 [2] Zinc–carbon: Carbon–zinc Zinc: NH 4 Cl Manganese (IV) oxide: No 1898 ...
Specific energy (MJ/kg) Energy density (MJ/L) Peak recovery efficiency % Practical recovery efficiency % Arbitrary Antimatter: 89,875,517,874: depends on density:
Volumetric energy density = 220 Wh/L (790 kJ/L) Gravimetric energy density > 90 Wh/kg [31] (> 320 J/g). Up to 160 Wh/kg [1] (580 J/g). Latest version announced in end of 2023, early 2024 made significant improvements in energy density from 180 up to 205 Wh/kg [32] without increasing production costs.
If a comet with this speed fell to the Earth it would gain another 63 MJ/kg, yielding a total of 2655 MJ/kg with a speed of 72.9 km/s. Since the equator is moving at about 0.5 km/s, the impact speed has an upper limit of 73.4 km/s, giving an upper limit for the specific energy of a comet hitting the Earth of about 2690 MJ/kg.
l/km (L/km) Use L/km to get "L/km" l/km impgal/mi; l/km usgal/mi; miles per imperial gallon mpgimp mpgimp mpgus; miles per US gallon mpgus (mpgUS, mpgU.S.) Use mpgUS to get "US" Use mpgU.S. to get "U.S." mpgus will give "U.S." if spelling is set to US & "US" otherwise mpgus mpgimp; imperial gallons per mile impgal/mi impgal/mi; US gallons per mile