a handful of these scales worldwide this one is in the united states at the national institute of standards and technology. the high precision scale is based on the principle of electromagnetic force compensation this is how it works the gravitational force of a test mass is balanced with an electromagnetic force the magnetic field is provided by a permanent magnet a coil of wire is immersed in that field. it s like a coil in a loudspeaker and the coil is in a permanent magnetic field an electrical current is run through it to generate a force that force is used to balance the downward force of the weight it s a way to measure weight using an electrical current of. a mission in other words the electrical current is adjusted until the upward force on the coil perfectly balances the downward force of the weight the 2nd step is called the
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