130년 만에 바뀌는 'kg 정의'...'키블 저울'로 잰다<br />The weight of a kilogram is set to be redefined by May 2019.<br />While it won't have much impact on our everyday life, the redefinition will be crucial for scientists and high tech industries.<br />Park Se-young has more. <br />Scientists have come up with a new, more accurate standard for defining the kilogram.<br />The current kilogram standard is the mass of a cylinder with a height and diameter of just over 39 millimeters made of 90 percent platinum and ten percent iridium. <br />However, the processes of oxidation and hydrocarbon contamination have added mass to the cylinder over the last 130 years.<br />The fine change in mass is crucial to the pharmaceutical and biotechnology industries.<br /><br />From next May, the kilogram will be redefined by a new standard maintained by the Kibble balance.<br />The balance measures the force produced by an electric current flowing through a coil in a magnetic field …that's required to support the weight of a standard kilogram mass. <br />Because the balance has a fixed value, it can precisely measure the weight of an object.<br />Korean researchers are working on reducing the measurement uncertainty of the domestically-developed kibble.<br /><br />"Countries without a standard unit have to go overseas with samples and calibrate the national prototype kilogram. Having a standard implies several advantages like the rapid dissemination of Korean industries."<br /><br />The change to the standard of mass will be crucial for the semiconductor and pharmaceutical industries, …but researchers say that the change will not have a noticeable effect on our everyday life.<br />Park Se-young, Arirang News. <br />
