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 ...

Class 11 Physics Notes for Chapter 2 Units and Measurements (Class 11 Physics NCERT textbook) are available here. This part is the continuation of Part I, the topics covered in this part are: Order of ...

For scientists, the story of metrology has a simple plot: to ensure that standards keep improving. The pound of Imperial France made way for the platinum Kilogram of the Archives in 1799. In 1889 it ...

For many, it's the start of a new semester of physics labs. That means there are new students in that introductory course. Of course, no one is really 100 percent ready to start these labs---but ...

If scientists had sacred objects, this would be one of them: a single, closely guarded 137-year-old cylinder of metal, housed in a vault outside of Paris. It is a prototype that precisely defines a ...