Joule

of these articles treats the physical unit joule. For the physicist of the same name see James Prescott joule


of joule
symbol J
dimension energy (E, W)
to SI 1 kg·m ² /s ² = 1 N·m = 1 W·s

the joule [ˈdʒuːl] (not [ˈdʒaʊ̯l]]) derived SI is - unit of the sizes of of the same name energy, work and amount of heat. The unit is designated after James Prescott joule. According to the different kinds of the derivation also the designations Newtonmeters and watt-second are common:

1 joule= 1 Newton · 1 meter = 1 N · 1 m = 1 Watt · 1 second = 1 W · 1 s = 1 coulomb · 1 V = 1K · 1 V

a joule is alikethe energy, which is needed, over:

  • to spend or on the duration of one second the achievement of a Watt apply
  • over the distance of a meter Kraft of Newton.

Under normal atmospheric pressure of 1013,25 hPa a gram becomesWater of 14,5 on 15,5 °C (of 287,65 to 288.65 Kelvin) warms up, if one supplies an energy of 4,1867 joules (in former times 1 calorie).

In SI fundamental units a joule computes itself as:

<math> 1~ {\ rm J} = 1~ {\ rm {N} \ cdot \ rm {m}} = 1~ \ frac {\ mathrm {kg} \ cdot \ mathrm {m} ^2} {\ mathrm {s} ^2}< /math>

Further is a thermodynamic cyclic process after it designated, the joule process.


SI prefixes
name Yotta Zetta Exa Peta Tera Giga mega Kilo of Hekto Deka
symbol Y Z E P T G M k h there
factor 10 24 10 21 10 18 1015 10 12 10 9 10 6 10 3 10 2 10 1
name Dezi Zenti milli micro nano pico Femto Atto Zepto Yocto
symbol D C m µ n p f A z y
factor 10 -1 10 -2 10 -3 10 -6 10 -9 10 -12 10 -15 10 -18 10 -21 10 -24


conversion into other energy units

  • electronvolt
    • 1 eV = 1,60219·10,-19 joules
  • of suppl. (cgs system)
    • 1 suppl. = 10 -7 J
  • Calorie
    • of 1 cal IT (international) = 4.1868 J; 1 J = 0.23885 cal IT
    • 1 cal th (thermochemically) = 4.184 J; 1 J = 0.23901 cal th
    • 1 cal 15 (14.5-15.5 °C) = 4.18580 J; 1 J = 0.23890 cal15
  • kilowatt-hour
    • a 1 KW/H = 3,6·10 6 J
  • kiloton
    • 1 TNT kt : = 4,186 · 10 12 J: The unit kt TNT (energy equivalent of 1000 tons of the explosive TNT) on exactly 10 12 cal was defined; it becomesparticularly to the statement of size of nuclear weapons uses.

see also

to order of magnitude (energy) - a related to value composition of everyday and unalltäglichen energies, which surround us to set up ideally in order size comparisons.


Energy units and conversion factors
of/after joules of kilowatt-hour electronvolt kilopond meter Calorie
of 1 J = 1 kg·m ² /s ² = 1 0,278 · 10 −6 6,241 · 10 18 0.102 0.239
1 KW·h = 3,6 · 10 6 1 22,5 · 10 24 0,367 · 10 6 0,860 · 10 6
1 eV= 0,1602 · 10 −18 44,5 · 10 −27 1 16,3 · 10 −21 33,8 · 10 −21
1 kp·m = 9,80665 2,72 · 10 −6 0,613 · 10 18 1 2.34
1 cal int = 4.1868 1,163 · 10−6 0,261 · 10 18 0.427 1
 

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