Once tied to a metal cylinder in France, the kilogram has now been redefined using the fundamental laws of physics.

"If you're using a counter, you have to define zero. You start counting at some point," physicist Marta Berholts from the University of Uppsala in Sweden, who led the team, explained to New Scientist ...

Can we reveal objects that are hidden in environments completely opaque to the human eye? With conventional imaging ...

The world’s best clocks may be sensitive to an odd mix of quantum and relativistic effects that would stretch time and test the boundaries of physics ...

She has helped robots learn to get around indoors and pick up balls from the ground. And she has developed computer programs ...

For centuries, scientific progress has depended on more precise tools for measuring the world around us. Galileo’s telescope ...

A hidden world of quantum metrologists ensure that everyday devices perform safely and correctly, but their work is never ...

By using something called a quantum grid, scientists have found a clever way to simultaneously measure momentum and position ...

Cold atoms could also potentially measure much lower vacuum pressures than ion gauges can. The current lowest pressure they’ve reliably measured is around 10 -9 Pa, and NIST scientists are working on ...

Stefan Hutzler and Louise Bradley explain how they turned the famous pitch-drop experiment into an outreach activity ...

The measurement problem in quantum mechanics looks at how an experimental outcome changes, simply by observing it.