An upcoming change to SI units – due to be officially approved this month – will mark the end of a long journey from defining quantities in terms of objects to using precise, unchanging and universal ...

In physics, we symbolise everything with an English/Greek alphabet, such as the speed of velocity, wavelength and other quantities as well. To make it more convenient for the students, teachers or ...

Deluged by responses to his request for your favourite units, Robert P Crease discovers that non-SI units persist, and are sometimes even popular, among the physics community Setting the standard ...