I was surprised that C&EN would devote two columns to the letter by Harvey Carroll on the matter of atomic weight versus atomic mass (C&EN, Jan. 24, page 4). I realize the majority of the informed ...

A nanogram (ng) is a unit of mass in the metric system, equal to one billionth (10-9) of a gram (g). The gram is a base unit of mass in the International System of Units (SI), making the nanogram a ...

The U.S. National Institute of Standards and Technology called this Friday a “turning point for humanity,” even though the difference between this day and the day before weighs, theoretically, nothing ...

IN a letter to NATURE, dated March 29, I stated that we have “no names for units of velocity, acceleration, impulse, momentum, &c.” This cannot be said now. Through the kindness of Messrs. Macmillan ...

Navigating global measurements? This guide simplifies kilograms and pounds for students. Understand the metric and imperial systems, their historical roots, and practical conversion techniques. Learn ...

The new kilogram has finally arrived. Updates to scientists’ system of measurement went into force May 20, redefining the kilogram and several other units in the metric system. The revamp does away ...