Word: denser
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Dates: during 1910-1919
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...cold waves is "due to thee gravity of the hydrostatic pressure due to the weight of the air in the rear of a volume of cold air advancing from the northwest, resulting from the diurnal rotation of the earth on its axis, giving a centrifugal force to the denser cold air greater than that of the neighboring warm air." This mechanical theory of the progress of the wave does not, however, explain exactly why the present (it is impossible at the moment to write "recent") cold wave should have sent the mercury down five degrees lower than any previous temperature...