![]() ![]() To define the tonne of TNT, this was standardized to 1 kilocalorie (4,184 joules) giving a value of 4.184 gigajoules (1 billion calories) for the tonne of TNT. Explosions Ī gram of TNT releases 4,100 to 4,600 joules (980 to 1,100 calories) upon explosion. Joule definition, the standard unit of work or energy in the International System of Units (SI), equal to the work done by a force of one newton when its point of application moves through a distance of one meter in the direction of the force: equivalent to 107 ergs and one watt-second. In slightly more fundamental terms, 1 joule is equal to 1 newton metre and, in terms of SI base units 1 J = 1 k g ( m s ) 2 = 1 k g ⋅ m 2 s 2 1\ being the proportionality constant. ![]() One ampere is equal to 1 coulomb, or 6.241 509 074 × 10 18 electrons worth of charge, moving past a point in a second. The corresponding CGS unit is the dyne, the force required to accelerate a one gram mass by one centimeter per second squared, or g·cm·s². The ampere (/ æ m p r /, US: / æ m p r / symbol: A), often shortened to amp, is the unit of electric current in the International System of Units (SI).
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