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Metrologists are measurement artists who are very precise – in the case of the Boltzmann constant up to the sixth decimal place. Whoever is able to determine it very exactly will cause a small revolution in the field of worldwide temperature measurement: The temperature unit will then no longer be based - as hitherto - on a chemico-physical material property, i.e. the triple point of water, but on an unchangeable fundamental constant.

By Karen Brooks HOUSTON (Reuters) - An unrelenting heat wave continued across the southern United States on Saturday, promising more of the triple-digit temperatures that have roasted the region for weeks.