As of January 2013, there are several proposals for redefining the kilogram yet again, including a proposal for defining it in terms of the Planck constant.
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Here, h is Planck constant, k is Boltzmann constant, c is the speed of light, and T emit is the temperature of the emitter.
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Where is the Planck constant, is the mass of a gas particle, k _ B is the Boltzmann constant, and is the temperature of the gas.
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Similarly, in the theories where the effects of quantum mechanics are irrelevant, the value of Planck constant ( " h ) " can be neglected.
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The energy of a single photon is given by E = h * c / wavelength, where c is the speed of light and h is plancks constant.
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If the kilogram is defined in terms of the Planck constant, it is likely there will only be a few at most watt balances initially operating in the world.
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These first results were also inconsistent with values of the Planck constant derived from watt balance measurements, although the source of the discrepancy is now believed to be known.
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In a model with large extra dimensions, the values of Planck constants can be radically different, and the formulae for Hawking radiation have to be modified as well.
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The most precise values of the Planck constant come from watt balance experiments, which are used to measure the product " K " " R"
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If these theories are slightly inaccurate though there is no evidence at present to suggest they are the methods would not give accurate values for the Planck constant.
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