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Memory Alpha

Millimeter of mercury (or mmHg) was a unit of measure for atmospheric pressure, measured on an instrument called a barometer or more advanced sensor.

The atmospheric pressure of the planet Taurus II was measured at 70 mmHg. (TOS: "The Galileo Seven")

The unit was also displayed on medical monitors measuring the blood circulation of a person among other vital signs. (TNG: "We'll Always Have Paris", "The Neutral Zone")

In 3189, an atomic scan on Philippa Georgiou's respiratory system revealed that the partial pressure of carbon dioxide (PaCO2) in her arterial blood was 42 mmHg. (DIS: "The Sanctuary")

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