Contrary to the beliefs of generations of chemistry students, Avogadro’s number—the number of particles in a unit known as a mole—was not discovered by Amadeo Avogadro (1776-1856). Avogadro was a ...

The Avogadro's number is a physical invariant which was put forward as a hypothesis in 1811 and was not conceptually defined until 1955. Its determination is still at the core of recent research.

If Avogadro's number is a fundamental constant in physics and chemistry, it's because it links the microscopic and macroscopic scales not only for weight quantities, but also for electrical and ...

An ongoing international effort to redefine the kilogram by 2018 has been helped by recent efforts from a team researchers from Italy, Japan and Germany to correlate two of the most precise ...

The early history of chemistry has many interesting stories. Just consider the problems scientists had 200 years ago as they tried to figure out some of the most basic ideas of chemistry. It was clear ...