mass

## Forget What Your Teacher Said: Mass And Weight Are The Same

At high school, your physics teacher probably drummed it into you that mass and weight are completely different things — but actually, they were wrong all along. In this video, Professor Mike Merrifield from the University of Nottingham — along with Albert Einstein and Isaac Newton — explains the equivalence principle. It says that mass and weight are, really, the same thing.

## The Kilogram Is Putting On Weight

There’s long been debate over the accuracy of the standardised kilogram. Now, scientists have shown once and for all that the lump of metal defining the unit of mass has been putting on some weight.

## How All Mass In The Universe Is Allowed To Exist

The Higgs boson discovery is a good excuse to learn a bit (and just a bit) about why it was so damn important in the first place. By now, you’ve probably heard that the Higgs is the final piece of the standard model of physics. But what does that actually mean?

## The Kilogram Is Losing Weight And That Might Screw The Metric System

We’ve long known that there were some issues with France’s ‘Le Grand K’, the international prototype for what a kilogram really is. Made in 1879 from platinum and iridium alloy, it is the perfect standard for what a kilogram weighs. The problem is it’s losing weight.