Ho-ming LEUNG, Shuk-ming LEE, Kin-yui LAM
Hong Kong Observatory
Converging Divergence, Vol. 30, 1 (2026)
Abstract
The use of mercury-in-glass thermometer to measure temperature at the Hong Kong Observatory has a long history. Recently, the mercury-in-glass thermometers have been replaced by non-mercury liquid filling thermometers following recommendation from the World Meteorological Organization. Details of the replacement process are described in this paper – including sourcing of suitable non-mercury liquid-in-glass thermometer, conduction of parallel-run study with existing mercury-in-glass thermometer and final selection of the replacement thermometer.
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