Temperature is not something that most people take into account when trying to find out what time it is -- unless your watch has frozen or melted that is. But in the ultra-precise world of atomic timekeeping, which governs navigation technology such as the global positioning system, the temperature is vital.
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Atomic clocks feel the heat
11 Aug 2006 Isabelle Dumé
Isabelle Dumé
is a contributing editor to Physics World