1. Normal blood pressure is considered around 120 over 80 millimeters of mercury . 2. Blood pressure is measured in millimeters of mercury , or mmHg, units. 3. A normal systolic blood pressure is about 120 millimeters of mercury . 4. Biologists and Atmospheric engineers measure pressures in millimeters of mercury instead of Pascals. 5. The blood pressure rose from zero to 50 millimeters of mercury . 6. Kreidenko said the pressure was currently 740-750 millimeters of mercury . 7. "In the human body, " he said, " the oxygen level, measured in millimeters of mercury , is 90. 8. Doctors define optimal blood pressure, associated with the lowest cardiovascular risk, as below 120 / 80 millimeters of mercury . 9. Their starting pressure, he said, " was 10 millimeters lower than anyone has studied . " Blood pressure is measured in millimeters of mercury . 10. One millimeter of mercury is approximately 1 torr, or 1 / 760 of standard atmospheric pressure ( | 760 } } = pascals ).