Caesium clocks have proved that an absolute measure of time is - impossible. Subscribe to the BBC News Magazine's email newsletter to get articles sent to your inbox. Top stories.

Caesium atoms are the basis of atomic clocks – on which global time standards depend – and they also play a key role in several metrological applications, including measurements of the fine-structure ...

Among caesium's 40 known isotopes, with mass numbers ranging from 112 to 151, only one is stable (133 Cs). The most common radioisotope is the uranium and plutonium fission product 137 Cs, which ...

Bunsen and Kirchhoff discovered cesium/caesium spectroscopically in 1860 in mineral water from Durkheim. It is obtain from the minerals Lepidolite and Pollucite (2Cs 2 O.2Al 2 O 3.9SiO 2.H 2 O), a ...

Progress in the field of Bose-Einstein condensation (BEC) continues apace with the announcement that physicists in Innsbruck have made a condensate with caesium for the first time. The news from ...

Caesium is listed as a critical mineral by both the US and Canada. It is used primarily (70%) as a low-viscosity fluid to help control well pressures and reduce friction during high-temperature ...

Caesium is the chemical element that has literally redefined time. It keeps time so accurately that it has even forced us to reconsider what time is.