(Conversion) Blood pressure is the force of blood circulating against the inner wall of blood vessels. It’s measured by two numbers: a systolic number that measures the pressure when the heart is contracting and a diastolic number that measures the pressure when the heart is resting. Both pressures are typically measured in millimeters of mercury (mm Hg) and given as systolic/diastolic numbers, such as 122/88.
The National Heart, Blood, and Lung Institute provides the following guidelines for normal and high blood pressure measurements. Complete the chart by converting the measurements to atm and psi units.
Classification | Systolic Pressure | Diastolic Pressure | ||||
| (mm Hg) | atm | psi (lb/in2) | (mm Hg) | atm | psi (lb/in2) |
Normal | < 120 |
|
| < 80 |
|
|
Prehypertensive | 120-139 |
|
| 80-89 |
|
|
Stage 1 hypertension | 140-159 |
|
| 90-99 |
|
|
Stage 2 hypertension | > 160 |
|
| > 100 |
|
|
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