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TNT equivalent is a convention for expressing energy, typically used to describe the energy released in an explosion. The ton of TNT is a unit of energy defined by that convention to be 4.184 gigajoules, which is the approximate energy released in the detonation of a metric ton (1,000 kilograms) of TNT. In other words, for each gram of TNT exploded, 4184 joules (or one large Calorie = 1,000 calories) of energy is released.
|Ton of TNT|
The explosion from a 14 kiloton nuclear test at the Nevada Test Site, in 1951.
|Symbol||t or ton of TNT|
|1 t in ...||... is equal to ...|
|SI base units||≈ 4.184 Gigajoules|
|US customary||3.968×106 BTU|
|Non-SI metric||1.162×103 kWh|
This convention intends to compare the destructiveness of an event with that of traditional explosive materials, of which TNT is a typical example, although other conventional explosives such as dynamite contain more energy.
Kiloton and megatonEdit
The "kiloton (of TNT)" is a unit of energy equal to 4.184 terajoules (4.184×1012 J).
The "megaton (of TNT)" is a unit of energy equal to 4.184 petajoules (4.184×1015 J).
The kiloton and megaton of TNT have traditionally been used to describe the energy output, and hence the destructive power, of a nuclear weapon. The TNT equivalent appears in various nuclear weapon control treaties, and has been used to characterize the energy released in such other highly destructive events as an asteroid impact.
Historical derivation of the valueEdit
Where for example the comparison is by energy yield, an explosive's energy is normally expressed for chemical purposes as the thermodynamic work produced by its detonation. For TNT this has been accurately measured as 4686 J/g from a large sample of air blast experiments, and theoretically calculated to be 4853 J/g.
But, even on this basis, comparing the actual energy yields of a large nuclear device and an explosion of TNT can be slightly inaccurate. Small TNT explosions, especially in the open, don't tend to burn the carbon-particle and hydrocarbon products of the explosion. Gas-expansion and pressure-change effects tend to "freeze" the burn rapidly. A large open explosion of TNT may maintain fireball temperatures high enough so that some of those products do burn up with atmospheric oxygen.
So, one can state that a nuclear bomb has a yield of 15 kt (6.3×1013 J); but an actual explosion of a 15000 ton pile of TNT may yield (for example) 8×1013 J due to additional carbon/hydrocarbon oxidation not present with small open-air charges.
A kiloton of TNT can be visualized as a cube of TNT 8.46 metres (27.8 ft) on a side.
|Grams TNT||Symbol||Tons TNT||Symbol||Energy [Joules]||Energy [Wh]||Corresponding mass loss|
|gram of TNT||g||microton of TNT||μt||4.184×103 J or 4.184 kilojoules||1.162 Wh||46.55 pg|
|kilogram of TNT||kg||milliton of TNT||mt||4.184×106 J or 4.184 megajoules||1.162 kWh||46.55 ng|
|megagram of TNT||Mg||ton of TNT||t||4.184×109 J or 4.184 gigajoules||1.162 MWh||46.55 μg|
|gigagram of TNT||Gg||kiloton of TNT||kt||4.184×1012 J or 4.184 terajoules||1.162 GWh||46.55 mg|
|teragram of TNT||Tg||megaton of TNT||Mt||4.184×1015 J or 4.184 petajoules||1.162 TWh||46.55 g|
|petagram of TNT||Pg||gigaton of TNT||Gt||4.184×1018 J or 4.184 exajoules||1.162 PWh||46.55 kg|
Conversion to other unitsEdit
1 ton TNT equivalent is approximately:
|Megatons of TNT||Energy [Wh]||Description|
|1×10−12||1.162 Wh||≈ 1 food Calorie (large Calorie, kcal), which is the approximate amount of energy needed to raise the temperature of one kilogram of water by one degree Celsius at a pressure of one atmosphere.|
|1×10−9||1.162 kWh||Under controlled conditions one kilogram of TNT can destroy (or even obliterate) a small vehicle.|
|1×10−8||11.62 kWh||The approximate radiant heat energy released during 3-phase, 600 V, 100 kA arcing fault in a 0.5 m × 0.5 m × 0.5 m (20 in × 20 in × 20 in) compartment within a 1-second period.[further explanation needed]|
|1.2×10−8||13.94 kWh||Amount of TNT used (12 kg) in Coptic church explosion in Cairo, Egypt on December 11, 2016 that left 25 dead|
|(1–44)×10−6||1.16–51.14 MWh||Conventional bombs yield from less than one ton to FOAB's 44 tons. The yield of a Tomahawk cruise missile is equivalent to 500 kg of TNT, or approximately 0.5 tons.|
|1.9×10−6||2.90 MWh||The television show MythBusters used 2.5 tons of ANFO to make "homemade" diamonds.|
|5×10−4||581 MWh||A real 0.5-kilotonne-of-TNT (2.1 TJ) charge at Operation Sailor Hat. If the charge were a full sphere, it would be 1 kilotonne of TNT (4.2 TJ).|
|(1–2)×10−3||1.16–2.32 GWh||Estimated yield of the Oppau explosion that killed more than 500 at a German fertilizer factory in 1921.|
|2.3×10−3||2.67 GWh||Amount of solar energy falling on 4,000 m2 (1 acre) of land in a year is 9.5 TJ (2,650 MWh) (an average over the Earth's surface).|
|3×10−3||3.49 GWh||The Halifax Explosion in 1917 was the accidental detonation of 200 tons of TNT and 2,300 tons of Picric acid|
|4×10−3||9.3 GWh||Minor Scale, a 1985 United States conventional explosion, using 4,744 tons of ANFO explosive to provide a scaled equivalent airblast of an eight kiloton (33.44 TJ) nuclear device, is believed to be the largest planned detonation of conventional explosives in history.|
|(1.5–2)×10−2||17.4–23.2 GWh||The Little Boy atomic bomb dropped on Hiroshima on August 6, 1945, exploded with an energy of about 15 kilotons of TNT (63 TJ), and the Fat Man atomic bomb dropped on Nagasaki on August 9, 1945, exploded with an energy of about 20 kilotons of TNT (84 TJ). The modern nuclear weapons in the United States arsenal range in yield from 0.3 kt (1.3 TJ) to 1.2 Mt (5.0 PJ) equivalent, for the B83 strategic bomb.|
|1||1.16 TWh||The energy contained in one megaton of TNT (4.2 PJ) is enough to power the average American household for 103,000 years. The 30 Mt (130 PJ) estimated upper limit blast power of the Tunguska event could power the same average home for more than 3,100,000 years. The energy of that blast could power the entire United States for 3.27 days.|
|3||3.5 TWh||The total energy of all explosives used in World War II, including the Hiroshima and Nagasaki atom bombs, is estimated to have been three megatons of TNT.|
|8.6||10 TWh||The energy released by a typical tropical cyclone in one minute, primarily from water condensation. Winds constitute 0.25% of that energy.|
|21.5||25 TWh||The complete conversion of 1 kg of matter into pure energy would yield the theoretical maximum (E = mc2) of 89.8 petajoules, which is equivalent to 21.5 megatons of TNT. No such method of total conversion as combining 500 grams of matter with 500 grams of antimatter has yet been achieved. In the event of proton–antiproton annihilation, approximately 50% of the released energy will escape in the form of neutrinos, which are almost undetectable. Electron–positron annihilation events emit their energy entirely as gamma rays.|
|24||28 TWh||Approximate total yield of the 1980 eruption of Mount St. Helens.|
|25–100||29–116 TWh||During the Cold War, the United States developed hydrogen bombs with maximum theoretical yields of 25 megatons of TNT (100 PJ). The Soviet Union developed a prototype weapon, nicknamed the Tsar Bomba, which was tested at 50 Mt (210 PJ), but had a maximum theoretical yield of 100 Mt (420 PJ). The effective destructive potential of such a weapon varies greatly, depending on such conditions as the altitude at which it is detonated, the characteristics of the target, the terrain, and the physical landscape upon which it is detonated.|
|26.3||30.6 TWh||Megathrust earthquakes 2004 Indian Ocean earthquake released record ME surface rupture energy, or potential for damage at 26.3 megatons of TNT (110 PJ).|
|200||232 TWh||The total energy released by the eruption of Mt. Krakatoa in Indonesia in 1883.|
|540||628 TWh||The total energy produced worldwide by all nuclear testing and combat combined, from the 1940s until the present is about 540 megatons.|
|1,460||1.69 PWh||The total global nuclear arsenal is about 15,000 nuclear warheads with a destructive capacity of around 1460 megatons or 1.460 gigatons (1,460 million tons) of TNT.|
|104,400||121 PWh||The total solar irradience energy received by Earth in the upper atmosphere per hour.|
|875,000||1,000 PWh||Approximate yield of the last eruption of the Yellowstone supervolcano.|
|6×106||6,973 PWh||The estimated energy at impact when the largest fragment of Comet Shoemaker–Levy 9 struck Jupiter is equivalent to 6 million megatons (6 trillion tons) of TNT.|
|9.32×106||10,831 PWh||The energy released in the 2011 Tōhoku earthquake and tsunami was over 200,000 times the surface energy and was calculated by the USGS at 3.9×1022 joules, slightly less than the 2004 Indian Ocean quake. This is equivalent to 9,320 gigatons of TNT, or approximately 600 million times the energy of the Hiroshima bomb.|
|9.56×106||11,110 PWh||Megathrust earthquakes record huge MW values, or total energy released. The 2004 Indian Ocean earthquake released 9,560 gigatons TNT equivalent.|
|1×108||116,222 PWh||The approximate energy released when the Chicxulub impact caused the mass extinction 65–66 million years ago was estimated to be equal to 100 teratons (i.e. 100 exagrams or approximately 220.462 quadrillion pounds) of TNT (a teraton equals 1 million megatons). That is roughly 8 billion times stronger than each of the bombs that hit Hiroshima and Nagasaki and the most energetic event on the history of Earth for hundreds of millions of years, far more powerful than any volcanic eruption, earthquake or firestorm. Such an explosion annihilated everything within a thousand miles of the impact in a split second. Such energy is equivalent to that needed to power the whole Earth for several centuries.|
|3×108 - 119×108||349 EWh to 14 ZWh||Later estimates for the Chicxulub impactor energy have climbed to between 300 million megatons and 11,900 million megatons.|
|5.972×1015||6.94×1027 Wh||The explosive energy of a quantity of TNT the mass of Earth.|
|7.89×1015||9.17×1027 Wh||Total solar output in all directions per day.|
|1.98×1021||2.3×1033 Wh||The explosive energy of a quantity of TNT the mass of the Sun.|
|(2.4–4.8)×1028||(2.8–5.6)×1040 Wh||A type 1a supernova explosion gives off 1–2×1044 joules of energy, which is about 2.4–4.8 hundred billion yottatons (24–48 octillion (2.4–4.8×1028) megatons) of TNT, equivalent to the explosive force of a quantity of TNT over a trillion (1012) times the mass of the planet Earth. This is the astrophysical standard candle used to determine galactic distances.|
|(2.4–4.8)×1030||(2.8–5.6)×1042 Wh||The largest type of supernova observed, gamma-ray bursts (GRBs) release more than 1046 joules of energy.|
|1.3×1032||1.5×1044 Wh||A merger of two black holes, resulting in the first observation of gravitational waves, released 5.3×1047 joules|
Relative effectiveness factorEdit
The relative effectiveness factor (RE factor) relates an explosive's demolition power to that of TNT, in units of the TNT equivalent/kg (TNTe/kg). The RE factor is the relative mass of TNT to which an explosive is equivalent: The greater the RE, the more powerful the explosive.
This enables engineers to determine the proper masses of different explosives when applying blasting formulas developed specifically for TNT. For example, if a timber-cutting formula calls for a charge of 1 kg of TNT, then based on octanitrocubane's RE factor of 2.38, it would take only 1.0/2.38 (or 0.42) kg of it to do the same job. Using PETN, engineers would need 1.0/1.66 (or 0.60) kg to obtain the same effects as 1 kg of TNT. With ANFO or ammonium nitrate, they would require 1.0/0.74 (or 1.35) kg or 1.0/0.42 (or 2.38) kg, respectively.
Calculating a single RE factor for an explosive is, however, impossible. It depends on the specific case or use. Given a pair of explosives, one can produce 2× the shockwave output (this depends on the distance of measuring instruments) but the difference in direct metal cutting ability may be 4× higher for one type of metal and 7× higher for another type of metal. The relative differences between two explosives with shaped charges will be even greater. The table below should be taken as an example and not as a precise source of data.
|Ammonium nitrate (AN + <0.5% H2O)||0.88||2700||0.42|
|Black powder (75% KNO3 + 19% C + 6% S, ancient explosives)||1.65||600||0.55|
|Tanerit Simply (93% granulated AN + 6% red P + 1% C)||0.90||2750||0.55|
|Hexamine dinitrate (HDN)||1.30||5070||0.60|
|HMTD (hexamine peroxide)||0.88||4520||0.74|
|ANFO (94% AN + 6% fuel oil)||0.92||5270||0.74|
|TATP (acetone peroxide)||1.18||5300||0.80|
|Tovex Extra (AN water gel) commercial product||1.33||5690||0.80|
|Hydromite 600 (AN water emulsion) commercial product||1.24||5550||0.80|
|ANNMAL (66% AN + 25% NM + 5% Al + 3% C + 1% TETA)||1.16||5360||0.87|
|Amatol (50% TNT + 50% AN)||1.50||6290||0.91|
|Tritonal (80% TNT + 20% aluminium)*||1.70||6650||1.05|
|Nickel hydrazine nitrate (NHN)||1.70||7000||1.05|
|Amatol (80% TNT + 20% AN)||1.55||6570||1.10|
|Nitrocellulose (13.5% N, NC; AKA guncotton)||1.40||6400||1.10|
|PBXW-126 (22% NTO, 20% RDX, 20% AP, 26% Al, 12% PU's system)*||1.80||6450||1.10|
|Diethylene glycol dinitrate (DEGDN)||1.38||6610||1.17|
|PBXIH-135 EB (42% HMX, 33% Al, 25% PCP-TMETN's system)*||1.81||7060||1.17|
|PBXN-109 (64% RDX, 20% Al, 16% HTPB's system)*||1.68||7450||1.17|
|Picric acid (TNP)||1.71||7350||1.17|
|Tetrytol (70% tetryl + 30% TNT)||1.60||7370||1.20|
|Dynamite, Nobel's (75% NG + 23% diatomite)||1.48||7200||1.25|
|Torpex (aka HBX, 41% RDX + 40% TNT + 18% Al + 1% wax)*||1.80||7440||1.30|
|Composition B (63% RDX + 36% TNT + 1% wax)||1.72||7840||1.33|
|Composition C-3 (78% RDX)||1.60||7630||1.33|
|Composition C-4 (91% RDX)||1.59||8040||1.37|
|Pentolite (56% PETN + 44% TNT)||1.66||7520||1.33|
|Semtex 1A (76% PETN + 6% RDX)||1.55||7670||1.35|
|Hexal (76% RDX + 20% Al + 4% wax)*||1.79||7640||1.35|
|RISAL P (50% IPN + 28% RDX + 15% Al + 4% Mg + 1% Zr + 2% NC)*||1.39||5980||1.40|
|Mixture: 24% nitrobenzene + 76% TNM||1.48||8060||1.50|
|Mixture: 30% nitrobenzene + 70% nitrogen tetroxide||1.39||8290||1.50|
|Methyl nitrate (MN)||1.21||7900||1.54|
|Octol (80% HMX + 19% TNT + 1% DNT)||1.83||8690||1.54|
|DADNE (1,1-diamino-2,2-dinitroethene, FOX-7)||1.77||8330||1.60|
|Gelignite (92% NG + 7% nitrocellulose)||1.60||7970||1.60|
|Plastics Gel® (in toothpaste tube: 45% PETN + 45% NG + 5% DEGDN + 4% NC)||1.51||7940||1.60|
|Composition A-5 (98% RDX + 2% stearic acid)||1.65||8470||1.60|
|Erythritol tetranitrate (ETN)||1.72||8206||1.60|
|PBXW-11 (96% HMX, 1% HyTemp, 3% DOA)||1.81||8720||1.60|
|Ethylene glycol dinitrate (EGDN)||1.49||8300||1.66|
|Octogen (HMX grade B)||1.86||9100||1.70|
|Hexanitrohexaazaisowurtzitane (HNIW; AKA CL-20)||1.97||9380||1.80|
|MEDINA (Methylene dinitroamine)||1.65||8700||1.93|
*: TBX (thermobaric explosives) or EBX (enhanced blast explosives), in a small, confined space, may have over twice the power of destruction. The total power of aluminized mixtures strictly depends on the condition of explosions.
(kilotons of TNT)
|Bomb used in Oklahoma City (ANFO based on racing fuel)||0.0018||2,300||0.78|
|GBU-57 bomb (Massive Ordnance Penetrator, MOP)||0.0035||13,600||0.26|
|Grand Slam (Earthquake bomb, M110)||0.0065||9,900||0.66|
|BLU-82 (Daisy Cutter)||0.0075||6,800||1.10|
|MOAB (non-nuclear bomb, GBU-43)||0.011||9,800||1.13|
|FOAB (advanced thermobaric bomb, ATBIP)||0.044||9,100||4.83|
|Davy Crockett (nuclear device), set to lower yield||0.022||23||1,000|
|Davy Crockett (nuclear device), set to higher yield||1.0||23||43,500|
|Hypothetical suitcase nuke||2.5||31||80,000|
|Fat Man (dropped on Nagasaki) A-bomb||20||4600||4,500|
|Classic (one-stage) fission A-bomb||22||420||50,000|
|W88 modern thermonuclear warhead (MIRV)||470||355||1,300,000|
|Typical (two-stage) nuclear bomb||500–1000||650–1120||900,000|
|W56 thermonuclear warhead||1,200||272–308||4,960,000|
|B53 nuclear bomb (two-stage)||9,000||4050||2,200,000|
|B41 nuclear bomb (three-stage)||25,000||4850||5,100,000|
|Tsar nuclear bomb (three-stage)||50,000–56,000||26,500||2,100,000|
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