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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.
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 ...
Planck was able to calculate the value of from experimental data on black-body radiation: his result, 6.55 × 10 −34 J⋅s, is within 1.2% of the currently defined value. [2] He also made the first determination of the Boltzmann constant k B {\displaystyle k_{\text{B}}} from the same data and theory.
Since 1 April 2019 a new regulation has been introduced that ensures that replicas are now measured in joules instead of fps, with BBs of at least 0.3 g instead of 0.2. Replicas have the following joule values: Bolt action sniper: 2.3 joules (499 fps with 0.2 g), DMR: 1.7 J (430 fps with 0.2 g), AEG: 1.2 J (360 fps with 0.2 g).
The gas constant is the constant of proportionality that relates the energy scale in physics to the temperature scale and the scale used for amount of substance. Thus, the value of the gas constant ultimately derives from historical decisions and accidents in the setting of units of energy, temperature and amount of substance.
Frame rate, most commonly expressed in frames per second or FPS, is typically the frequency (rate) at which consecutive images ( frames) are captured or displayed. This definition applies to film and video cameras, computer animation, and motion capture systems. In these contexts, frame rate may be used interchangeably with frame frequency and ...
One joule represents (approximately): The typical energy released as heat by a person at rest every 1/60 s (~ 16.6667 ms, basal metabolic rate ); about 5,000 kJ (1,200 kcal) / day. The amount of electricity required to run a 1 W device for 1 s. The energy required to accelerate a 1 kg mass at 1 m/s 2 through a distance of 1 m.
The unit of substance in the FPS system is the pound-mole (lb-mol) = 273.16 × 1024. Until the SI decided to adopt the gram-mole, the mole was directly derived from the mass unit as (mass unit)/ (atomic mass unit). The unit (lbf⋅s 2 /ft)-mol also appears in a former definition of the atmosphere.