“a truly portable mass standard—a chip that can be sent anywhere to calibrate scales instantly.”
– The solution arrived in 2019. The international community redefined the kilogram using a constant of nature: Planck’s constant. This new definition is inherently portable. Any laboratory with a Kibble balance (or watt balance) can measure mass directly from fundamental physics, without reference to a single, fragile artifact. a weighty issue ielts reading answers portable
According to Paragraph D, what is the ultimate goal of researchers? “a truly portable mass standard—a chip that can