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It refers to the barometric pressure in the hurricane's eye. A lower barometric pressure generally means a stronger storm.

Hg is the chemical symbol for the element Mercury, a metal that is liquid at room temperature. Barometric pressure is often given in units of either mmHg (millimeters of mercury) or inHg (inches of mercury). Both units refer to the early barometers, which consisted of a vacuum tube with its open end immersed in a dish of Mercury. Pressure was measured based on how high up the mercury moved in the tube, which climbed higher with higher pressures.

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9y ago

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