Manufacturing Bits: June 28


Redefining the kilogram The National Institute of Standards and Technology (NIST) has developed a new scale that could one day enable a new and improved definition of the kilogram. The scale is called the NIST-4 watt balance. It has conducted its first measurement of a physical quantity called Planck’s constant to within 34 parts per billion. The scale is not intended to alter the va... » read more