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The joule (pronounced / ˈdʒuːl /, JOOL or / ˈdʒaʊl / JOWL; symbol: J) is the unit of energy in the International System of Units (SI). [ 1] It is equal to the amount of work done when a force of one newton displaces a mass through a distance of one metre in the direction of that force. It is also the energy dissipated as heat when an ...
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 convention to be 4.184 gigajoules ( 1 gigacalorie ), [1] which is the approximate energy released in the detonation of a metric ton (1,000 kilograms) of TNT.
Energy is defined via work, so the SI unit of energy is the same as the unit of work – the joule (J), named in honour of James Prescott Joule [1] and his experiments on the mechanical equivalent of heat. In slightly more fundamental terms, 1 joule is equal to 1 newton metre and, in terms of SI base units. An energy unit that is used in atomic ...
t. e. Power is the amount of energy transferred or converted per unit time. In the International System of Units, the unit of power is the watt, equal to one joule per second. Power is a scalar quantity. Specifying power in particular systems may require attention to other quantities; for example, the power involved in moving a ground vehicle ...
kT. (energy) kT. kT. kT (also written as kBT) is the product of the Boltzmann constant, k (or kB ), and the temperature, T. This product is used in physics as a scale factor for energy values in molecular -scale systems (sometimes it is used as a unit of energy), as the rates and frequencies of many processes and phenomena depend not on their ...
Photon energy is often measured in electronvolts. To find the photon energy in electronvolt using the wavelength in micrometres, the equation is approximately = since / = 1.239 841 984... × 10 −6 eV⋅m where h is the Planck constant, c is the speed of light, and e is the elementary charge.
List of orders of magnitude for energy; Factor (joules) SI prefix Value Item 10 −34: 6.626×10 −34 J: Photon energy of a photon with a frequency of 1 hertz. 8x10-34 J: Average kinetic energy of translational motion of a molecule at the lowest temperature reached (38 picokelvin as of 2021)
Muzzle energy is the kinetic energy of a bullet as it is expelled from the muzzle of a firearm. Without consideration of factors such as aerodynamics and gravity for the sake of comparison, muzzle energy is used as a rough indication of the destructive potential of a given firearm or cartridge. The heavier the bullet and especially the faster ...