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DW Tomorrow Today August 26, 2019 04:48:00

A dot com slash science drop us a line at e.w. underscores site tech on facebook d w dot science. if you put a specific extremely large number of silicon atoms together to create a sphere of a certain size it will weigh exactly one kilogram scientists have succeeded in doing that and why to define what a kilogram is in terms of a natural constant in this case the of a god or a constant. it s a way to check the accuracy of another new definition in terms of the planck constant this has me. been adopted as the official definition of world wide difficult stuff but it is important anyway to take the measure of things. it s a weighty matter welcomed the new kilogram we now take a look at a project based on that new official definition. since 2017 thomas and his team at the technical university. have been working on ....

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DW Tomorrow Today August 26, 2019 04:53:00

Velocity mode of precision laser called an interferometer shown here in green is used to measure the position and velocity of the coil. the aim is to measure the voltage that is created in the process. then we need gravitational acceleration small g. 9.81 meters per 2nd per 2nd if you know all these things very precisely you can calculate the numerical value for h. the math isn t complicated in reverse if you know the value of h. the planck constant you can specify a kilogram. the planck scales from germany will work in exactly the same way they re basically a water bottle and on the left is the laser interferometer on the right is the balance based on the principle of electromagnetic force compensation but it s ....

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DW Tomorrow Today August 26, 2019 04:54:00

A lot smaller than its american counterpart. if i reverse the principle of the water balance and say i know the value of h. then i can use my plank scales to calibrate any weight. i simply made my object on the one side and then relate to your metric of values to the planck s constant and from that i can calculate the mass on the scale. of. the 2 planck scale prototypes from the technical university ill menow will eventually be put to industrial use currently they can be used to determine weights in the range between one milligram and 100 grams but it will be another 3 to 5 years before the 1st planck scale goes to market the paris kilogram meanwhile has already lost its status as the international benchmark and is now being consigned to a museum. along with the kilogram and the 2nd and the meter they are all sorts of the units of ....

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DW Tomorrow Today August 26, 2019 04:51:00

Planck constant. just dance and before you can think of it has the smallest possible unit of energy if you consider the energy coming out of a car battery or an electric socket on the walls and if you were to divide that into lots of small amounts the smallest possible amount would be the plug constant it s a fundamental constants of nature it s involved in many aspects of physics. when one reason why we can t take the planck s constant as the definition of this mass is because the planck constant can be expressed in terms of the kilogram and 2 other units that s why we were able to establish a relationship between the value of the cube a gram and the plumb constant. this can be done using a watch balance for example it s a highly complex instrument that s been used since the 1980 s. to measure the planck constant as precisely as possible. there are only ....

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